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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @package   WordPress Dynamic CSS  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @version   1.0.5  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author    Askupa Software <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link      https://github.com/askupasoftware/wp-dynamic-css  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright 2016 Askupa Software  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Dynamic CSS Cache Handler  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class DynamicCSSCache  | 
            
                            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var DynamicCSSCache The reference to *Singleton* instance of this class  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $instance;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @var array The reference to the cached compiled CSS that is stored in the database   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static $cache;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns the *Singleton* instance of this class.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return DynamicCSSCache The *Singleton* instance.  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public static function get_instance()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (null === static::$instance)   | 
            
                            
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                        { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            static::$instance = new static();  | 
            
                            
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                            self::load_cache();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return static::$instance;  | 
            
                            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns the compiled CSS for the given handle if it exists in the cache.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns false otherwise.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $handle The handle of the stylesheet  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return boolean|string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function get( $handle )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if( array_key_exists( $handle, self::$cache ) )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return self::$cache[$handle];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Update the compiled CSS for the given handle.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $handle The handle of the stylesheet  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $compiled_css  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function update( $handle, $compiled_css )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::$cache[$handle] = $compiled_css;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->update_option();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Clear the compiled CSS from cache for the given handle.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $handle The handle of the stylesheet  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function clear( $handle )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        unset(self::$cache[$handle]);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->update_option();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Load the cache value from the database or create an empty array if the  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * cache is empty.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private static function load_cache()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        self::$cache = get_option('wp-dynamic-css-cache'); | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if( false === self::$cache )  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            self::$cache = array();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Update the database option with the local cache value.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function update_option()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        update_option('wp-dynamic-css-cache', self::$cache); | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    }  | 
            
            
                                                        
            
                                    
            
            
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                }  | 
            
            
                        
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