<?php
	class WpFastestCacheCreateCache extends WpFastestCache{
		public $options = array();
		public $cdn;
		private $startTime;
		private $blockCache = false;
		private $err = "";
		public $cacheFilePath = "";
		public $exclude_rules = false;
		public $preload_user_agent = false;
		public $current_page_type = false;
		public $current_page_content_type = false;
		public $exclude_current_page_text = false;

		public function __construct(){
			//to fix: PHP Notice: Undefined index: HTTP_USER_AGENT
			$_SERVER['HTTP_USER_AGENT'] = isset($_SERVER['HTTP_USER_AGENT']) && $_SERVER['HTTP_USER_AGENT'] ? strip_tags($_SERVER['HTTP_USER_AGENT']) : "Empty User Agent";
			
			if(preg_match("/(WP\sFastest\sCache\sPreload(\siPhone\sMobile)?\s*Bot)/", $_SERVER['HTTP_USER_AGENT'])){
				$this->preload_user_agent = true;
			}else{
				$this->preload_user_agent = false;
			}


			$this->options = $this->getOptions();

			$this->set_cdn();

			$this->set_cache_file_path();

			$this->set_exclude_rules();

			if(isset($this->options->wpFastestCacheDisableEmojis) && $this->options->wpFastestCacheDisableEmojis){
				add_action('init', array($this, 'disable_emojis'));
			}
		}

		public function disable_emojis(){
			remove_action('wp_head', 'print_emoji_detection_script', 7);
			remove_action('admin_print_scripts', 'print_emoji_detection_script');
			remove_filter('the_content_feed', 'wp_staticize_emoji');
			remove_filter('comment_text_rss', 'wp_staticize_emoji');
			remove_action('wp_print_styles', 'print_emoji_styles');
			remove_action('admin_print_styles', 'print_emoji_styles');
			remove_filter('wp_mail', 'wp_staticize_emoji_for_email');
			// remove the DNS prefetch
			add_filter('emoji_svg_url', '__return_false');
		}

		public function detect_current_page_type(){
			if(preg_match("/\?/", $_SERVER["REQUEST_URI"])){
				return true;
			}
			
			if(preg_match("/^\/wp-json/", $_SERVER["REQUEST_URI"])){
				return true;
			}

			if(is_front_page()){
				echo "<!--WPFC_PAGE_TYPE_homepage-->";
			}else if(is_category()){
				echo "<!--WPFC_PAGE_TYPE_category-->";
			}else if(is_tag()){
				echo "<!--WPFC_PAGE_TYPE_tag-->";
			}else if(is_singular('post')){
				echo "<!--WPFC_PAGE_TYPE_post-->";
			}else if(is_page()){
				echo "<!--WPFC_PAGE_TYPE_page-->";
			}else if(is_attachment()){
				echo "<!--WPFC_PAGE_TYPE_attachment-->";
			}else if(is_archive()){
				echo "<!--WPFC_PAGE_TYPE_archive-->";
			}
		}

		public function set_exclude_rules(){
			if($json_data = get_option("WpFastestCacheExclude")){
				$this->exclude_rules = json_decode($json_data);
			}
		}

		public function set_cache_file_path(){
			$type = "all";

			if($this->isMobile() && isset($this->options->wpFastestCacheMobile)){
				if(class_exists("WpFcMobileCache") && isset($this->options->wpFastestCacheMobileTheme)){
					$type = "wpfc-mobile-cache";
				}
			}

			if($this->isPluginActive('gtranslate/gtranslate.php')){
				if(isset($_SERVER["HTTP_X_GT_LANG"])){
					$this->cacheFilePath = $this->getWpContentDir("/cache/".$type."/").$_SERVER["HTTP_X_GT_LANG"].$_SERVER["REQUEST_URI"];
				}else if(isset($_SERVER["REDIRECT_URL"]) && $_SERVER["REDIRECT_URL"] != "/index.php"){
                    $redirect_url =  $_SERVER["REDIRECT_URL"];

                    if(isset($_SERVER["REDIRECT_QUERY_STRING"]) && defined('WPFC_CACHE_QUERYSTRING') && WPFC_CACHE_QUERYSTRING){
                        $redirect_url .= "?".$_SERVER["REDIRECT_QUERY_STRING"];
                    }

                    $this->cacheFilePath = $this->getWpContentDir("/cache/" . $type . "/") . $redirect_url;
				}else if(isset($_SERVER["REQUEST_URI"])){
					$this->cacheFilePath = $this->getWpContentDir("/cache/".$type."/").$_SERVER["REQUEST_URI"];
				}
			}else{
				$this->cacheFilePath = $this->getWpContentDir("/cache/".$type."/").$_SERVER["REQUEST_URI"];

				// for /?s=
				$this->cacheFilePath = preg_replace("/(\/\?s\=)/", "$1/", $this->cacheFilePath);
			}


			$this->cacheFilePath = $this->cacheFilePath ? rtrim($this->cacheFilePath, "/")."/" : "";

			/*
				/public_html/wp-content/cache/all/sample-page
			*/
			$this->cacheFilePath = preg_replace("/\/cache\/(all|wpfc-mobile-cache)\/\//", "/cache/$1/", $this->cacheFilePath);

			/*
				/public_html/wp-content/cache/all/DOMAIN.COM/sample-page
			*/
			$this->cacheFilePath = preg_replace("/\/cache\/([^\/]+)\/(all|wpfc-mobile-cache)\/\//", "/cache/$1/$2/", $this->cacheFilePath);


			if(strlen($_SERVER["REQUEST_URI"]) > 1){ // for the sub-pages
				if(!preg_match("/\.(html|xml)/i", $_SERVER["REQUEST_URI"])){
					if($this->is_trailing_slash()){
						if(!preg_match("/\/$/", $_SERVER["REQUEST_URI"])){
							if(isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"] && defined('WPFC_CACHE_QUERYSTRING') && WPFC_CACHE_QUERYSTRING){
							
							}else if(preg_match("/y(ad|s)?clid\=/i", $this->cacheFilePath)){
								// yclid
								// yadclid
								// ysclid
							}else if(preg_match("/gclid\=/i", $this->cacheFilePath)){
								
							}else if(preg_match("/fbclid\=/i", $this->cacheFilePath)){

							}else if(preg_match("/utm_(source|medium|campaign|content|term)/i", $this->cacheFilePath)){

							}else if(preg_match("/srsltid\=/i", $this->cacheFilePath)){

							}else{
								$this->cacheFilePath = false;
							}
						}
					}else{
						//toDo
					}
				}
			}
			
			$this->remove_url_paramters();

			$this->cacheFilePath = trim($this->cacheFilePath);

			// to decode path if it is not utf-8
			if($this->cacheFilePath){
				$this->cacheFilePath = urldecode($this->cacheFilePath);
			}

			// for security
			if(preg_match("/\.{2,}/", $this->cacheFilePath)){
				$this->cacheFilePath = false;
			}

			if(preg_match("/\/{2,}/", $this->cacheFilePath)){
				$this->cacheFilePath = false;
			}

			if($this->cacheFilePath == "/"){
				$this->cacheFilePath = false;
			}

			if($this->isMobile()){
				if(isset($this->options->wpFastestCacheMobile)){
					if(!class_exists("WpFcMobileCache")){
						$this->cacheFilePath = false;
					}else{
						if(!isset($this->options->wpFastestCacheMobileTheme)){
							$this->cacheFilePath = false;
						}
					}
				}
			}
		}

		public function remove_url_paramters(){
			if(isset($_SERVER["QUERY_STRING"]) && $_SERVER["QUERY_STRING"]){
				
				$query_params = explode("&", $_SERVER["QUERY_STRING"]);

				$action = true;

				foreach ($query_params as $key => $query_param) {

					// Google Ads Click & Conversion Parameters
					if(preg_match("/^(gclid|gbraid|wbraid|gclsrc)\=/i", $query_param)){
						continue;
					}

					// Google Analytics / GA4 Parameters
					if(preg_match("/^(_ga|_gid|_gl|_gac)\=/i", $query_param)){
						continue;
					}

					// Google UTM Campaign Parameters
					if(preg_match("/^utm_(source|medium|campaign|content|term)/i", $query_param)){
						continue;
					}

					// Google Merchant Center
					if(preg_match("/^srsltid\=/i", $query_param)){
						continue;
					}

					//to remove query strings for cache if Yandex parameters are set
					if(preg_match("/^y(ad|s)?clid\=/i", $query_param)){
						// yclid
						// yadclid
						// ysclid
						
						continue;
					}

					//to remove query strings for cache if facebook parameters are set
					if(preg_match("/^fbclid\=/i", $query_param)){
						continue;
					}

					$action = false;

				}

				if($action){
					if(strlen($_SERVER["REQUEST_URI"]) > 1){ // for the sub-pages

						$this->cacheFilePath = preg_replace("/\/*\?.+/", "", $this->cacheFilePath);
						$this->cacheFilePath = $this->cacheFilePath."/";

						if(!defined('WPFC_CACHE_QUERYSTRING')){
							define('WPFC_CACHE_QUERYSTRING', true);
						}
					}
				}
			}
			
		}

		public function set_cdn(){
			$cdn_values = get_option("WpFastestCacheCDN");
			if($cdn_values){
				$std_obj = json_decode($cdn_values);
				$arr = array();

				if(is_array($std_obj)){
					$arr = $std_obj;
				}else{
					array_push($arr, $std_obj);
				}

				foreach ($arr as $key => &$std) {
					$std->originurl = trim($std->originurl);
					$std->originurl = trim($std->originurl, "/");
					$std->originurl = preg_replace("/http(s?)\:\/\/(www\.)?/i", "", $std->originurl);

					$std->cdnurl = trim($std->cdnurl);
					$std->cdnurl = trim($std->cdnurl, "/");
					
					if(!preg_match("/https\:\/\//", $std->cdnurl)){
						$std->cdnurl = "//".preg_replace("/http(s?)\:\/\/(www\.)?/i", "", $std->cdnurl);
					}
				}
				
				$this->cdn = $arr;
			}
		}

		public function checkShortCode($content){
			if(preg_match("/\[wpfcNOT\]/", $content)){
				if(!is_home() || !is_archive()){
					$this->blockCache = true;
				}
				$content = str_replace("[wpfcNOT]", "", $content);
			}
			return $content;
		}

		public function createCache(){		
			if(isset($this->options->wpFastestCacheStatus)){

				// to exclude static pdf files
				if(preg_match("/\.pdf$/i", $_SERVER["REQUEST_URI"])){
					return 0;
				}

                // Block requests containing null byte injection attempts (%00 encoded or actual \0 character)
                if (strpos($_SERVER["REQUEST_URI"], '%00') !== false || strpos($_SERVER["REQUEST_URI"], "\0") !== false) {
                    return 0;
                }

				// to check logged-in user
				if(isset($this->options->wpFastestCacheLoggedInUser) && $this->options->wpFastestCacheLoggedInUser == "on"){
					foreach ((array)$_COOKIE as $cookie_key => $cookie_value){
						if(preg_match("/wordpress_logged_in/i", $cookie_key)){
							ob_start(array($this, "cdn_rewrite"));

							return 0;
						}
					}
				}

				// to exclude admin users
				if($this->is_user_admin()){
					return 0;
				}

				// to check comment author
				foreach ((array)$_COOKIE as $cookie_key => $cookie_value){
					if(preg_match("/comment_author_/i", $cookie_key)){
						ob_start(array($this, "cdn_rewrite"));

						return 0;
					}
				}

				if(isset($_COOKIE) && isset($_COOKIE['safirmobilswitcher'])){
					ob_start(array($this, "cdn_rewrite"));

					return 0;
				}

				if(isset($_COOKIE) && isset($_COOKIE["wptouch-pro-view"])){
					if($this->is_wptouch_smartphone()){
						if($_COOKIE["wptouch-pro-view"] == "desktop"){
							ob_start(array($this, "cdn_rewrite"));

							return 0;
						}
					}
				}

				if(preg_match("/\?/", $_SERVER["REQUEST_URI"]) && !preg_match("/\/\?fdx\_switcher\=true/", $_SERVER["REQUEST_URI"])){ // for WP Mobile Edition
					if(preg_match("/\?amp(\=1)?/i", $_SERVER["REQUEST_URI"])){
						//
					}else if(defined('WPFC_CACHE_QUERYSTRING') && WPFC_CACHE_QUERYSTRING){
						//
					}else if(isset($_GET["wc-api"]) && $_GET["wc-api"]){
						//
					}else{
						ob_start(array($this, "cdn_rewrite"));
						
						return 0;
					}
				}

				if(preg_match("/(".$this->get_excluded_useragent().")/", $_SERVER['HTTP_USER_AGENT'])){
					return 0;
				}

				if(isset($_SERVER['REQUEST_URI']) && preg_match("/(\/){2}$/", $_SERVER['REQUEST_URI'])){
					return 0;
				}

				// to check permalink if it does not end with slash
				if(isset($_SERVER['REQUEST_URI']) && preg_match("/[^\/]+\/$/", $_SERVER['REQUEST_URI'])){
					if(!preg_match("/\/$/", get_option('permalink_structure'))){
						return 0;
					}
				}

				if(isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] == "POST"){
					return 0;
				}

				if(preg_match("/^https/i", get_option("home")) && !is_ssl()){
					//Must be secure connection
					return 0;
				}

				if(!preg_match("/^https/i", get_option("home")) && is_ssl()){
					//must be normal connection
					if(!$this->isPluginActive('really-simple-ssl/rlrsssl-really-simple-ssl.php')){
						if(!$this->isPluginActive('really-simple-ssl-pro/really-simple-ssl-pro.php')){
							if(!$this->isPluginActive('really-simple-ssl-on-specific-pages/really-simple-ssl-on-specific-pages.php')){
								if(!$this->isPluginActive('ssl-insecure-content-fixer/ssl-insecure-content-fixer.php')){
									if(!$this->isPluginActive('https-redirection/https-redirection.php')){
										if(!$this->isPluginActive('better-wp-security/better-wp-security.php')){
											return 0;
										}
									}
								}
							}
						}
					}
				}

				if(isset($_SERVER["DOCUMENT_ROOT"]) && preg_match("/bitnami/", $_SERVER["DOCUMENT_ROOT"])){
					// to disable cache for the IP based urls on the bitnami servers
					// /opt/bitnami/apps/wordpress/htdocs
					if(preg_match("/(?:[0-9]{1,3}\.){3}[0-9]{1,3}/", get_option("home"))){
						return 0;
					}
				}

				if(preg_match("/www\./i", get_option("home")) && !preg_match("/www\./i", $_SERVER['HTTP_HOST'])){
					return 0;
				}

				if(!preg_match("/www\./i", get_option("home")) && preg_match("/www\./i", $_SERVER['HTTP_HOST'])){
					return 0;
				}

				if($this->exclude_page()){
					ob_start(array($this, "cdn_rewrite"));
					
					//echo "<!-- Wp Fastest Cache: Exclude Page -->"."\n";
					return 0;
				}

				// http://mobiledetect.net/ does not contain the following user-agents
				if(preg_match("/Nokia309|Casper_VIA/i", $_SERVER['HTTP_USER_AGENT'])){
					return 0;
				}

				if(preg_match("/Empty\sUser\sAgent/i", $_SERVER['HTTP_USER_AGENT'])){ // not to show the cache for command line
					return 0;
				}


				//to show cache version via php if htaccess rewrite rule does not work
				if(!$this->preload_user_agent && $this->cacheFilePath && (@file_exists($this->cacheFilePath."index.html") || @file_exists($this->cacheFilePath."index.json") || @file_exists($this->cacheFilePath."index.xml"))){

					$via_php = "";
					if(@file_exists($this->cacheFilePath."index.json")){
						$file_extension = "json";

						header('Content-type: application/json');
					}else if(@file_exists($this->cacheFilePath."index.xml")){
						$file_extension = "xml";

						header('Content-type: text/xml');
					}else{
						$file_extension = "html";
						$via_php = "<!-- via php -->";
					}

					if($content = @file_get_contents($this->cacheFilePath."index.".$file_extension)){

						if($file_extension == "html"){
							header('Last-Modified: '.gmdate('D, d M Y H:i:s', filemtime($this->cacheFilePath."index.".$file_extension)).' GMT', true, 200);
						}


						if(defined('WPFC_REMOVE_VIA_FOOTER_COMMENT') && WPFC_REMOVE_VIA_FOOTER_COMMENT){
							$via_php = "";
						}

						$content = $content.$via_php;

						die($content);
					}
				}else{
					if($this->isMobile()){
						if(class_exists("WpFcMobileCache") && isset($this->options->wpFastestCacheMobileTheme)){
							if(isset($this->options->wpFastestCacheMobileTheme_themename) && $this->options->wpFastestCacheMobileTheme_themename){
								$create_cache = true;
							}else if($this->isPluginActive('wptouch/wptouch.php') || $this->isPluginActive('wptouch-pro/wptouch-pro.php')){
								//to check that user-agent exists in wp-touch's list or not
								if($this->is_wptouch_smartphone()){
									$create_cache = true;
								}else{
									$create_cache = false;
								}
							}else{
								if((preg_match('/iPhone/', $_SERVER['HTTP_USER_AGENT']) && preg_match('/Mobile/', $_SERVER['HTTP_USER_AGENT'])) || (preg_match('/Android/', $_SERVER['HTTP_USER_AGENT']) && preg_match('/Mobile/', $_SERVER['HTTP_USER_AGENT']))){
									$create_cache = true;
								}else{
									$create_cache = false;
								}
							}
						}else if(!isset($this->options->wpFastestCacheMobile) && !isset($this->options->wpFastestCacheMobileTheme)){
							$create_cache = true;
						}else{
							$create_cache = false;
						}
					}else{
						$create_cache = true;
					}

					if($create_cache){
						$this->startTime = microtime(true);


						add_action('wp', array($this, "detect_current_page_type"));
						add_action('get_footer', array($this, "detect_current_page_type"));
						add_action('get_footer', array($this, "wp_print_scripts_action"));

						// to exclude current page hook
						add_action("wpfc_exclude_current_page", array($this, 'exclude_current_page'), 10, 0);

						ob_start(array($this, "callback"));
					}
				}
			}
		}

		public function is_user_admin(){
			global $wpdb;

			foreach ((array)$_COOKIE as $cookie_key => $cookie_value){
				if(preg_match("/wordpress_logged_in/i", $cookie_key)){
					$username = preg_replace("/^([^\|]+)\|.+/", "$1", $cookie_value);
					break;
				}
			}

			if(isset($username) && $username){
				$username = esc_sql($username);

				$res = $wpdb->get_var("SELECT `$wpdb->users`.`ID`, `$wpdb->users`.`user_login`, `$wpdb->usermeta`.`meta_key`, `$wpdb->usermeta`.`meta_value` 
									   FROM `$wpdb->users` 
									   INNER JOIN `$wpdb->usermeta` 
									   ON `$wpdb->users`.`user_login` = \"$username\" AND 
									   `$wpdb->usermeta`.`meta_key` LIKE \"%_user_level\" AND 
									   `$wpdb->usermeta`.`meta_value` = \"10\" AND 
									   `$wpdb->users`.`ID` = `$wpdb->usermeta`.user_id ;"
									);

				return $res;
			}

			return false;
		}

		public function exclude_current_page($some = true){
			$via = debug_backtrace();

			if(isset($via) && is_array($via)){
				foreach ($via as $key => $value){
					if($value["function"] == "wpfc_exclude_current_page"){
						
						if(defined('WPFC_DEBUG') && (WPFC_DEBUG === true)){
							if(preg_match("/wp-content\/themes/", $value["file"])){
								$this->exclude_current_page_text = "<!-- This page has been excluded by ".basename($value["file"])." of the Theme -->";
							}else if(preg_match("/wp-content\/plugins/", $value["file"])){
								$this->exclude_current_page_text = "<!-- This page has been excluded by ".basename($value["file"])." of ".preg_replace("/([^\/]+)\/.+/", "$1", plugin_basename($value["file"]))." -->";
							}
						}else{
							$this->exclude_current_page_text = "<!-- This page has been excluded -->";
						}

						break;
					}
				}
			}
		}

		public function wp_print_scripts_action(){
			echo "<!--WPFC_FOOTER_START-->";
		}

		public function ignored($buffer){
			$list = array(
						"\/wp\-comments\-post\.php",
						"\/wp\-login\.php",
						"\/robots\.txt",
						"\/wp\-cron\.php",
						"\/wp\-content",
						"\/wp\-admin",
						"\/wp\-includes",
						"\/index\.php",
						"\/xmlrpc\.php",
						"\/wp\-api\/",
						"leaflet\-geojson\.php",
						"\/clientarea\.php"
					);
			if($this->isPluginActive('woocommerce/woocommerce.php')){
				if($this->current_page_type != "homepage"){
					global $post;

					if(isset($post->ID) && $post->ID){
						if(function_exists("wc_get_page_id")){
							$woocommerce_ids = array();

							//wc_get_page_id('product')
							//wc_get_page_id('product-category')
							
							array_push($woocommerce_ids, wc_get_page_id('cart'), wc_get_page_id('checkout'), wc_get_page_id('receipt'), wc_get_page_id('confirmation'), wc_get_page_id('myaccount'));

							if (in_array($post->ID, $woocommerce_ids)) {
								return true;
							}
						}
					}

					//"\/product"
					//"\/product-category"

					array_push($list, "\/cart\/?$", "\/checkout", "\/receipt", "\/confirmation", "\/wc-api\/");
				}
			}

			if($this->isPluginActive('wp-easycart/wpeasycart.php')){
				array_push($list, "\/cart");
			}

			if($this->isPluginActive('easy-digital-downloads/easy-digital-downloads.php')){
				array_push($list, "\/cart", "\/checkout");
			}

			if(preg_match("/".implode("|", $list)."/i", $_SERVER["REQUEST_URI"])){
				return true;
			}

			return false;
		}

		public function exclude_page($buffer = false){
			$preg_match_rule = "";
			//$request_url = urldecode(trim($_SERVER["REQUEST_URI"], "/"));
			$request_url = urldecode($_SERVER["REQUEST_URI"]);

			if($this->exclude_rules){

				foreach((array)$this->exclude_rules as $key => $value){
					$value->type = isset($value->type) ? $value->type : "page";

					if($value->prefix == "yandexclickid"){
						if(preg_match("/y(ad|s)?clid\=/i", $request_url)){
							// yclid
							// yadclid
							// ysclid
							
							return true;
						}
					}else if($value->prefix == "googleanalytics"){
						if(preg_match("/utm_(source|medium|campaign|content|term)/i", $request_url)){
							return true;
						}
					}else if(isset($value->prefix) && $value->prefix && ($value->type == "page")){
						$value->content = trim($value->content);
						//$value->content = trim($value->content, "/");

						if($buffer && preg_match("/^(homepage|category|tag|post|page|archive|attachment)$/", $value->prefix)){
							if(preg_match('/<\!--WPFC_PAGE_TYPE_'.$value->prefix.'-->/i', $buffer)){
								return true;
							} 
						}else if($value->prefix == "exact"){
							$request_url = trim($request_url, "/");
							$value->content = trim($value->content, "/");

							if(strtolower($value->content) == strtolower($request_url)){
								return true;	
							}
						}else if($value->prefix == "regex"){
							if(preg_match("/".$value->content."/i", $request_url)){
								return true;
							}
						}else{
							if($value->prefix == "startwith"){
								$request_url = ltrim($request_url, "/");
								$value->content = ltrim($value->content, "/");

								$preg_match_rule = "^".preg_quote($value->content, "/");
							}else if($value->prefix == "contain"){
								$preg_match_rule = preg_quote($value->content, "/");
							}

							if($preg_match_rule){
								if(preg_match("/".$preg_match_rule."/i", $request_url)){
									return true;
								}
							}
						}
					}else if($value->type == "useragent"){
						if(preg_match("/".preg_quote($value->content, "/")."/i", $_SERVER['HTTP_USER_AGENT'])){
							return true;
						}
					}else if($value->type == "cookie"){
						if(isset($_SERVER['HTTP_COOKIE'])){

							if($value->prefix == "regex"){
								if(preg_match("/".$value->content."/i", $_SERVER['HTTP_COOKIE'])){
									return true;
								}
							}

							if($value->prefix == "contain"){
								if(preg_match("/".preg_quote($value->content, "/")."/i", $_SERVER['HTTP_COOKIE'])){
									return true;
								}
							}

						}
						
					}
				}
				
			}
			return false;
		}

		public function is_json(){
			return $this->current_page_content_type == "json" ? true : false;

			// if(isset($_SERVER["HTTP_ACCEPT"]) && preg_match("/json/i", $_SERVER["HTTP_ACCEPT"])){
			// 	return true;
			// }

			// if(preg_match("/^\/wp-json/", $_SERVER["REQUEST_URI"])){
			// 	return true;
			// }

			// if(preg_match("/^\s*\{\s*[\"\']/i", $buffer)){
			// 	return true;
			// }

			// if(preg_match("/^\s*\[\s*\{\s*[\"\']/i", $buffer)){
			// 	return true;
			// }

			// return false;
		}

		public function is_xml(){
			return $this->current_page_content_type == "xml" ? true : false;
			
			// if(preg_match("/^\s*\<\?xml/i", $buffer)){
			// 	return true;
			// }
			// return false;
		}

		public function is_html(){
			return $this->current_page_content_type == "html" ? true : false;
		}

		public function set_current_page_type($buffer){
			preg_match('/<\!--WPFC_PAGE_TYPE_([a-z]+)-->/i', $buffer, $out);

			$this->current_page_type = isset($out[1]) ? $out[1] : false;
		}

		public function set_current_page_content_type($buffer){
			$content_type = false;
			if(function_exists("headers_list")){
				$headers = headers_list();
				foreach($headers as $header){
					if(preg_match("/Content-Type\:/i", $header)){
						$content_type = preg_replace("/Content-Type\:\s(.+)/i", "$1", $header);
					}
				}
			}

			if(preg_match("/xml/i", $content_type)){
				$this->current_page_content_type = "xml";
			}else if(preg_match("/json/i", $content_type)){
				$this->current_page_content_type = "json";
			}else{
				$this->current_page_content_type = "html";
			}
		}

		public function last_error($buffer = false){
			if(function_exists("http_response_code") && (http_response_code() === 404)){
				return true;
			}

			if(is_404()){
				return true;
			}

			//to exclude "There has been a critical error on this website" page
			if(preg_match("/<body\sid\=\"error-page\">\s*<div\sclass\=\"wp-die-message\">/i", $buffer)){
				return true;
			}
		}

		public function callback($buffer){
			$this->set_current_page_type($buffer);
			$this->set_current_page_content_type($buffer);

			$buffer = $this->checkShortCode($buffer);

			// for Wordfence: not to cache 503 pages
			if(defined('DONOTCACHEPAGE') && $this->isPluginActive('wordfence/wordfence.php')){
				if(function_exists("http_response_code") && http_response_code() == 503){
					return $buffer."<!-- DONOTCACHEPAGE is defined as TRUE -->";
				}
			}

			// Prevent caching of 403 Forbidden error pages.
			// This is particularly important for compatibility with the following security plugins:
			// 1. iThemes Security
			// 2. Defender Security
			if(defined('DONOTCACHEPAGE')){
				if(function_exists("http_response_code") && http_response_code() == 403){
					return $buffer."<!-- DONOTCACHEPAGE is defined as TRUE -->";
				}
			}

			// for Divi Theme
			if(defined('DONOTCACHEPAGE') && (get_template() == "Divi")){
				if(isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest'){
					// /?wc-ajax=dgwt_wcas_ajax_search&s=keyword&l=en
					return $buffer;
				}

				return $buffer."<!-- DONOTCACHEPAGE is defined as TRUE -->";
			}


			if($this->exclude_page($buffer)){
				$buffer = preg_replace('/<\!--WPFC_PAGE_TYPE_[a-z]+-->/i', '', $buffer);

				$buffer = $this->cdn_rewrite($buffer);

				return $buffer;
			}

			$buffer = preg_replace('/<\!--WPFC_PAGE_TYPE_[a-z]+-->/i', '', $buffer);


			if($this->is_html()){
				$tmp_buffer = (string) apply_filters('wpfc_buffer_callback_filter', $buffer, "html", $this->cacheFilePath);

				if(!$tmp_buffer){
					return $buffer;
				}else{
					$buffer = $tmp_buffer;
				}
			}


			if($this->exclude_current_page_text){
				return $buffer.$this->exclude_current_page_text;
			}else if($this->is_json() && (!defined('WPFC_CACHE_JSON') || (defined('WPFC_CACHE_JSON') && WPFC_CACHE_JSON !== true))){
				return $buffer;
			}else if(preg_match("/Mediapartners-Google|Google\sWireless\sTranscoder/i", $_SERVER['HTTP_USER_AGENT'])){
				return $buffer;
			}else if (is_user_logged_in() || $this->isCommenter()){
				return $buffer;
			}else if($this->isPasswordProtected($buffer)){
				return $buffer."<!-- Password protected content has been detected -->";
			}else if($this->isWpLogin($buffer)){
				return $buffer."<!-- wp-login.php -->";
			}else if($this->hasContactForm7WithCaptcha($buffer)){
				return $buffer."<!-- This page was not cached because ContactForm7's captcha -->";
			}else if($this->last_error($buffer)){
				return $buffer;
			}else if($this->ignored($buffer)){
				return $buffer;
			}else if($this->blockCache === true){
				return $buffer."<!-- wpfcNOT has been detected -->";
			}else if(isset($_GET["preview"])){
				return $buffer."<!-- not cached -->";
			}else if($this->checkHtml($buffer)){
				if(preg_match("/^.*$/s", $buffer)){
					// Check if the buffer has only one line (no line breaks)
					return $buffer;
				}else{
					return $buffer."<!-- html is corrupted -->";
				}
			}else if((function_exists("http_response_code")) && (http_response_code() == 301 || http_response_code() == 302)){
				return $buffer;
			}else if(!$this->cacheFilePath){
				return $buffer."<!-- permalink_structure ends with slash (/) but REQUEST_URI does not end with slash (/) -->";
			}else{
				$content = $buffer;

				if(isset($this->options->wpFastestCacheDelayJS) && method_exists("WpFastestCachePowerfulHtml", "render_blocking")){
					if(file_exists(WPFC_WP_PLUGIN_DIR."/wp-fastest-cache-premium/pro/library/delay-js.php")){
						if(!$this->is_amp($content)){
							include_once WPFC_WP_PLUGIN_DIR."/wp-fastest-cache-premium/pro/library/delay-js.php";
							$delay = new WpFastestCacheDelayJS($content);
							$content = $delay->action();
						}
					}
				}

				if(isset($this->options->wpFastestCacheRenderBlocking) && method_exists("WpFastestCachePowerfulHtml", "render_blocking")){
					if(class_exists("WpFastestCachePowerfulHtml")){
						if(!$this->is_amp($content)){
							$powerful_html = new WpFastestCachePowerfulHtml();

							if(isset($this->options->wpFastestCacheRenderBlockingCss)){
								$content = $powerful_html->render_blocking($content, true);
							}else{
								$content = $powerful_html->render_blocking($content);
							}
						}
					}
				}

				if(isset($this->options->wpFastestCacheCombineCss)){
					require_once "css-utilities.php";
					$css = new CssUtilities($this, $content);
					$content = $css->combineCss();
					unset($css);
				}else if(isset($this->options->wpFastestCacheMinifyCss)){
					require_once "css-utilities.php";
					$css = new CssUtilities($this, $content);
					$content = $css->minifyCss();
					unset($css);
				}

				if(isset($this->options->wpFastestCacheCombineJs) || isset($this->options->wpFastestCacheMinifyJs) || isset($this->options->wpFastestCacheCombineJsPowerFul)){
					require_once "js-utilities.php";
				}

				if(isset($this->options->wpFastestCacheCombineJs)){

					$head_new = $this->get_header($content);

				    if($head_new){
						if(isset($this->options->wpFastestCacheMinifyJs) && $this->options->wpFastestCacheMinifyJs){
							$js = new JsUtilities($this, $head_new, true);
						}else{
							$js = new JsUtilities($this, $head_new);
						}

						$tmp_head = $js->combine_js();

						$content = str_replace($head_new, $tmp_head, $content);

						unset($r);
						unset($js);
						unset($tmp_head);
						unset($head_new);
				    }
				}

				if(class_exists("WpFastestCachePowerfulHtml")){
					if(!isset($powerful_html)){
						$powerful_html = new WpFastestCachePowerfulHtml();
					}

					$powerful_html->set_html($content);

					if(isset($this->options->wpFastestCacheCombineJsPowerFul) && method_exists("WpFastestCachePowerfulHtml", "combine_js_in_footer")){
						if(isset($this->options->wpFastestCacheMinifyJs) && $this->options->wpFastestCacheMinifyJs){
							$content = $powerful_html->combine_js_in_footer($this, true);
						}else{
							$content = $powerful_html->combine_js_in_footer($this);
						}
					}
					
					if(isset($this->options->wpFastestCacheRemoveComments)){
						$content = $powerful_html->remove_head_comments();
					}

					if(isset($this->options->wpFastestCacheMinifyHtmlPowerFul)){
						$content = $powerful_html->minify_html();
					}

					if(isset($this->options->wpFastestCacheMinifyJs) && method_exists("WpFastestCachePowerfulHtml", "minify_js_in_body")){
						$content = $powerful_html->minify_js_in_body($this, $this->exclude_rules);
					}
				}

				if($this->err){
					return $buffer."<!-- ".$this->err." -->";
				}else{
					$content = $this->cacheDate($content);
					$content = $this->minify($content);
					$content = str_replace("<!--WPFC_FOOTER_START-->", "", $content);


					if(isset($this->options->wpFastestCacheLazyLoad) && class_exists("WpFastestCachePowerfulHtml")){
						$execute_lazy_load = true;
						
						// to disable Lazy Load if the page is amp
						if($this->is_amp($content)){
							$execute_lazy_load = false;
						}
						
						// to disable for Ajax Load More on the pages
						if($this->isPluginActive('ajax-load-more/ajax-load-more.php') && preg_match("/\/page\/\d+\//", $_SERVER["REQUEST_URI"])){
							$execute_lazy_load = false;
						}

						if($execute_lazy_load){
							if(!class_exists("WpFastestCacheLazyLoad")){
								include_once $this->get_premium_path("lazy-load.php");
							}

							$content = $powerful_html->lazy_load($content);

							if(method_exists("WpFastestCacheLazyLoad",'get_js_source_new')){
								$lazy_load_js = WpFastestCacheLazyLoad::get_js_source_new();
							}else if(method_exists("WpFastestCacheLazyLoad",'get_js_source')){
								$lazy_load_js = WpFastestCacheLazyLoad::get_js_source();
							}

							$content = preg_replace("/\s*<\/head\s*>/i", $lazy_load_js."</head>", $content, 1);
						}
					}

					$content = $this->cdn_rewrite($content);

					$content = $this->fix_pre_tag($content, $buffer);

					if(preg_match("/<link[^\>]+href\s*\=\s*[\'\"][^\"\']+\.\.[\"\'][^\>]+>/", $content)){
						/*
						to check that resources have been successfully optimized
						<link rel='stylesheet'  href='//site.com/wp-content/cache/wpfc-minified/895p0t5d/..' media='all' />
						*/
						return $buffer."<!-- Cache has NOT been created due to optimized resource -->";
					}

					if($this->cacheFilePath){
						if($this->is_html()){

							$tmp_content = (string) apply_filters('wpfc_buffer_callback_filter', $content, "cache", $this->cacheFilePath);

							if(!$tmp_content){
								return $content;
							}else{
								$content = $tmp_content;
							}

							$this->createFolder($this->cacheFilePath, $content);
							do_action('wpfc_is_cacheable_action');
						}else if($this->is_xml()){
							if(preg_match("/<link><\/link>/", $buffer)){
								if(preg_match("/\/feed$/", $_SERVER["REQUEST_URI"])){
									return $buffer.time();
								}
							}

							$this->createFolder($this->cacheFilePath, $buffer, "xml");
							do_action('wpfc_is_cacheable_action');

							return $buffer;
						}else if($this->is_json()){
							$this->createFolder($this->cacheFilePath, $buffer, "json");
							do_action('wpfc_is_cacheable_action');

							return $buffer;
						}
					}

					return $content."<!-- need to refresh to see cached version -->";
				}
			}
		}


		public function find_tags($data, $start_string, $end_string){

			$list = array();
			$start_index = false;
			$end_index = false;

			for($i = 0; $i < strlen( $data ); $i++) {
			    if(substr($data, $i, strlen($start_string)) == $start_string){
			    	$start_index = $i;
				}

				if($start_index && $i > $start_index){
					if(substr($data, $i, strlen($end_string)) == $end_string){
						$end_index = $i + strlen($end_string)-1;
						$text = substr($data, $start_index, ($end_index-$start_index + 1));
						

						array_push($list, array("start" => $start_index, "end" => $end_index, "text" => $text));


						$start_index = false;
						$end_index = false;
					}
				}
			}

			return $list;
		}

		public function fix_pre_tag($content, $buffer){

		    // Check if buffer contains any <pre> tag
		    if(!preg_match("/<pre[^\>]*>/i", $buffer)){
		        return $content;
		    }

		    // Extract <pre> blocks from buffer
		    $pre_buffer = $this->find_tags($buffer, "<pre", "</pre>");

		    // Extract <pre> blocks from content
		    $pre_content = $this->find_tags($content, "<pre", "</pre>");

		    // If either side has no <pre> blocks, do nothing
		    if(empty($pre_buffer) || empty($pre_content)){
		        return $content;
		    }

		    // Reverse the order to avoid index shifting during replacement
		    $pre_content = array_reverse($pre_content, true);

		    foreach ($pre_content as $key => $value){
		        if(isset($pre_buffer[$key])){

		            // New <pre> block that will replace the old one
		            $replace_text = $pre_buffer[$key]["text"];

		            // Replace the original <pre> block in the content with the buffer's block
		            $content = substr_replace(
		                $content,
		                $replace_text,
		                $value["start"],
		                ($value["end"] - $value["start"] + 1)
		            );
		        }
		    }

		    return $content;
		}



		public function cdn_rewrite($content){
			if($this->cdn){
				$content = preg_replace_callback("/(srcset|src|href|data-vc-parallax-image|data-bg|data-bg-webp|data-fullurl|data-mobileurl|data-img-url|data-cvpsrc|data-cvpset|data-thumb|data-bg-url|data-large_image|data-lazyload|data-lazy|data-source-url|data-srcsmall|data-srclarge|data-srcfull|data-slide-img|data-lazy-original)\s{0,2}\=\s{0,2}[\'\"]([^\'\"]+)[\'\"]/i", array($this, 'cdn_replace_urls'), $content);

				//url()
				$content = preg_replace_callback("/(url)\(([^\)\>]+)\)/i", array($this, 'cdn_replace_urls'), $content);

				//{"concatemoji":"http:\/\/your_url.com\/wp-includes\/js\/wp-emoji-release.min.js?ver=4.7"}
				$content = preg_replace_callback("/\{\"concatemoji\"\:\"[^\"]+\"\}/i", array($this, 'cdn_replace_urls'), $content);
				
				//<script>var loaderRandomImages=["https:\/\/www.site.com\/wp-content\/uploads\/2016\/12\/image.jpg"];</script>
				$content = preg_replace_callback("/[\"\']([^\'\"]+)[\"\']\s*\:\s*[\"\']https?\:\\\\\/\\\\\/[^\"\']+[\"\']/i", array($this, 'cdn_replace_urls'), $content);

				// <script>
				// jsFileLocation:"//domain.com/wp-content/plugins/revslider/public/assets/js/"
				// </script>
				$content = preg_replace_callback("/(jsFileLocation)\s*\:[\"\']([^\"\']+)[\"\']/i", array($this, 'cdn_replace_urls'), $content);

				// <form data-product_variations="[{&quot;src&quot;:&quot;//domain.com\/img.jpg&quot;}]">
				// <div data-siteorigin-parallax="{&quot;backgroundUrl&quot;:&quot;https:\/\/domain.com\/wp-content\/TOR.jpg&quot;,&quot;backgroundSize&quot;:[830,467],&quot;}" data-stretch-type="full">
				$content = preg_replace_callback("/(data-product_variations|data-siteorigin-parallax)\=[\"\'][^\"\']+[\"\']/i", array($this, 'cdn_replace_urls'), $content);

				// <object data="https://site.com/source.swf" type="application/x-shockwave-flash"></object>
				$content = preg_replace_callback("/<object[^\>]+(data)\s{0,2}\=[\'\"]([^\'\"]+)[\'\"][^\>]+>/i", array($this, 'cdn_replace_urls'), $content);
			}

			return $content;
		}

		public function get_header($content){
			$head_first_index = strpos($content, "<head");
			$head_last_index = strpos($content, "</head>");

			return substr($content, $head_first_index, ($head_last_index-$head_first_index + 1));
		}

		public function minify($content){
			$content = preg_replace("/<\/html>\s+/", "</html>", $content);
			$content = str_replace("\r", "", $content);
			return isset($this->options->wpFastestCacheMinifyHtml) ? preg_replace("/^\s+/m", "", ((string) $content)) : $content;
		}

		public function checkHtml($buffer){
			if(!$this->is_html()){
				return false;
			}

			if(preg_match('/<\s*html[^\>]*>/si', $buffer) && preg_match('/<\s*body[^\>]*>/si', $buffer) && preg_match('/<\/body\s*>/si', $buffer)){
				return false;
			}
			// if(strlen($buffer) > 10){
			// 	return false;
			// }

			return true;
		}

		public function cacheDate($buffer){
			$prefix = ($this->isMobile() && class_exists("WpFcMobileCache") && isset($this->options->wpFastestCacheMobile) && isset($this->options->wpFastestCacheMobileTheme)) 
			    ? "Mobile: " 
			    : "";

			$comment = "<!-- {$prefix}WP Fastest Cache file was created in " . $this->creationTime() . " seconds, on " . date(get_option('date_format') . ' @ ' . get_option('time_format'), current_time('timestamp')) . " -->";



			if(apply_filters( 'wpfc_remove_footer_comment', false )){
				$comment = "";
			}

			if(defined('WPFC_REMOVE_FOOTER_COMMENT') && WPFC_REMOVE_FOOTER_COMMENT){
				$comment = "";
			}

			return $buffer.$comment;
			
		}

		public function creationTime(){
			$time = microtime(true) - $this->startTime;
			$time = number_format($time, 3);

			return $time;
		}

		public function isCommenter(){
			$commenter = wp_get_current_commenter();
			return isset($commenter["comment_author_email"]) && $commenter["comment_author_email"] ? true : false;
		}
		public function isPasswordProtected($buffer){
			if(preg_match("/action\=[\'\"].+postpass.*[\'\"]/", $buffer)){
				return true;
			}

			foreach($_COOKIE as $key => $value){
				if(preg_match("/wp\-postpass\_/", $key)){
					return true;
				}
			}

			return false;
		}

		public function create_name($list){
			$arr = is_array($list) ? $list : array(array("href" => $list));
			$name = "";
			
			foreach ($arr as $tag_key => $tag_value){
				$tmp = preg_replace("/(\.css|\.js)\?.*/", "$1", $tag_value["href"]); //to remove version number
				$name = $name.$tmp;
			}
			
			return base_convert(crc32($name), 20, 36);
		}

		public function createFolder($cachFilePath, $buffer, $extension = "html", $prefix = false){
			$create = false;
			$file_name = "index.";
			$update_db_statistic = true;
			
			if($buffer && strlen($buffer) > 100 && preg_match("/html|xml|json/i", $extension)){
				if(!preg_match("/^\<\!\-\-\sMobile\:\sWP\sFastest\sCache/i", $buffer)){
					if(!preg_match("/^\<\!\-\-\sWP\sFastest\sCache/i", $buffer)){
						$create = true;
					}
				}

				if($this->preload_user_agent){
					if(file_exists($cachFilePath."/"."index.".$extension)){
						$update_db_statistic = false;
						@unlink($cachFilePath."/"."index.".$extension);
					}
				}
			}

			if(($extension == "svg" || $extension == "woff" || $extension == "css" || $extension == "js") && $buffer && strlen($buffer) > 5){
				$create = true;
				$file_name = base_convert(substr(time(), -6), 20, 36).".";
				$buffer = trim($buffer);

				if($extension == "js"){
					if(substr($buffer, -1) != ";"){
						$buffer .= ";";
					}
				}
			}

			if (is_user_logged_in() || $this->isCommenter()){
				$create = false;
			}

			if($create){
				
				if(!is_dir($cachFilePath)){
					if(is_writable($this->getWpContentDir()) || ((is_dir($this->getWpContentDir("/cache"))) && (is_writable($this->getWpContentDir("/cache"))))){
						if (@mkdir($cachFilePath, 0755, true)){

							if($extension == "html"){
			   					if(!file_exists($this->getWpContentDir("/cache/index.html"))){
			   						@file_put_contents($this->getWpContentDir("/cache/index.html"), "");
			   					}
			   				}else{

			   					if(!file_exists($this->getWpContentDir("/cache/wpfc-minified/index.html"))){
			   						if(!is_dir($this->getWpContentDir("/cache/wpfc-minified/"))){
			   							@mkdir($this->getWpContentDir("/cache/wpfc-minified/"), 0755, true);
			   						}

			   						if(is_dir($this->getWpContentDir("/cache/wpfc-minified/"))){
			   							@file_put_contents($this->getWpContentDir("/cache/wpfc-minified/index.html"), "");
			   						}
			   					}

			   				}

						}
					}
				}

				if(is_dir($cachFilePath)){
					if(!file_exists($cachFilePath."/".$file_name.$extension)){

						if($extension != "html"){
							$buffer = (string) apply_filters('wpfc_buffer_callback_filter', $buffer, $extension, $cachFilePath);
						}

						file_put_contents($cachFilePath."/".$file_name.$extension, $buffer);
						
						if(class_exists("WpFastestCacheStatics")){
							if($update_db_statistic && !preg_match("/After\sCache\sTimeout/i", $_SERVER['HTTP_USER_AGENT'])){
								if(preg_match("/wpfc\-mobile\-cache/", $cachFilePath)){
									$extension = "mobile";
								}

				   				$cache_statics = new WpFastestCacheStatics($extension, strlen($buffer));
				   				$cache_statics->update_db();
							}
		   				}
					
					}

				}

			}elseif($extension == "html"){
				$this->err = "Buffer is empty so the cache cannot be created";
			}
		}

		public function is_amp($content){
			global $redux_builder_amp;
			$action = false;
			$request_uri = trim($_SERVER["REQUEST_URI"], "/");

			if(preg_match("/^amp/", $request_uri)){
				$action = true;
			}

			if(preg_match("/amp$/", $request_uri)){
				$action = true;
			}

			if(preg_match("/\/amp\//", $request_uri)){
				$action = true;
			}

			if(preg_match("/\?amp\=1$/", $request_uri)){
				$action = true;
			}

			if(preg_match("/web-stories\//", $request_uri)){
				// https://wordpress.org/plugins/web-stories/
				$action = true;
			}

			if(isset($redux_builder_amp) && isset($redux_builder_amp['ampforwp-amp-takeover']) && ($redux_builder_amp['ampforwp-amp-takeover'] == true)){
				$action = true;
			}

			if($action){
				if(preg_match("/<html[^\>]+amp[^\>]*>/i", $content)){
					return true;
				}

				if(preg_match("/<html[^\>]+\⚡[^\>]*>/i", $content)){
					return true;
				}
			}

			return false;
		}

		public function isMobile(){
			foreach ($this->get_mobile_browsers() as $value) {
				if(preg_match("/".$value."/i", $_SERVER['HTTP_USER_AGENT'])){
					return true;
				}
			}

			foreach ($this->get_operating_systems() as $key => $value) {
				if(preg_match("/".$value."/i", $_SERVER['HTTP_USER_AGENT'])){
					return true;
				}
			}

		    if(isset($_SERVER['HTTP_CLOUDFRONT_IS_MOBILE_VIEWER']) && "true" === $_SERVER['HTTP_CLOUDFRONT_IS_MOBILE_VIEWER']){
		        $is_mobile = true;
		    }


		    if(isset($_SERVER['HTTP_CLOUDFRONT_IS_TABLET_VIEWER']) && "true" === $_SERVER['HTTP_CLOUDFRONT_IS_TABLET_VIEWER']){
		        $is_mobile = true;
		    }

		}

		public function isWpLogin($buffer){
			// if(preg_match("/<form[^\>]+loginform[^\>]+>((?:(?!<\/form).)+)user_login((?:(?!<\/form).)+)user_pass((?:(?!<\/form).)+)<\/form>/si", $buffer)){
			// 	return true;
			// }
			if($GLOBALS["pagenow"] == "wp-login.php"){
				return true;
			}

			return false;
		}

		public function hasContactForm7WithCaptcha($buffer){
			if(is_single() || is_page()){
				if(preg_match("/<input[^\>]+_wpcf7_captcha[^\>]+>/i", $buffer)){
					return true;
				}
			}
			
			return false;
		}

		public function is_wptouch_smartphone(){
			// https://plugins.svn.wordpress.org/wptouch/tags/4.0.4/core/mobile-user-agents.php
			// wptouch: ipad is accepted as a desktop so no need to create cache if user agent is ipad 
			// https://wordpress.org/support/topic/plugin-wptouch-wptouch-wont-display-mobile-version-on-ipad?replies=12
			if(preg_match("/ipad/i", $_SERVER['HTTP_USER_AGENT'])){
				return false;
			}

			$wptouch_smartphone_list = array();

			$wptouch_smartphone_list[] = array( 'iPhone' ); // iPhone
			$wptouch_smartphone_list[] = array( 'Android', 'Mobile' ); // Android devices
			$wptouch_smartphone_list[] = array( 'BB', 'Mobile Safari' ); // BB10 devices
			$wptouch_smartphone_list[] = array( 'BlackBerry', 'Mobile Safari' ); // BB 6, 7 devices
			$wptouch_smartphone_list[] = array( 'Firefox', 'Mobile' ); // Firefox OS devices
			$wptouch_smartphone_list[] = array( 'IEMobile/11', 'Touch' ); // Windows IE 11 touch devices
			$wptouch_smartphone_list[] = array( 'IEMobile/10', 'Touch' ); // Windows IE 10 touch devices
			$wptouch_smartphone_list[] = array( 'IEMobile/9.0' ); // Windows Phone OS 9
			$wptouch_smartphone_list[] = array( 'IEMobile/8.0' ); // Windows Phone OS 8
			$wptouch_smartphone_list[] = array( 'IEMobile/7.0' ); // Windows Phone OS 7
			$wptouch_smartphone_list[] = array( 'OPiOS', 'Mobile' ); // Opera Mini iOS
			$wptouch_smartphone_list[] = array( 'Coast', 'Mobile' ); // Opera Coast iOS

			foreach ($wptouch_smartphone_list as $key => $value) {
				if(isset($value[0]) && isset($value[1])){
					if(preg_match("/".preg_quote($value[0], "/")."/i", $_SERVER['HTTP_USER_AGENT'])){
						if(preg_match("/".preg_quote($value[1], "/")."/i", $_SERVER['HTTP_USER_AGENT'])){
							return true;
						}
					}
				}else if(isset($value[0])){
					if(preg_match("/".preg_quote($value[0], "/")."/i", $_SERVER['HTTP_USER_AGENT'])){
						return true;
					}
				}
			}

			return false;
		}


	}
?>