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✏️ Editing: Cache_File_Cleaner.php

<?php
namespace W3TC;

/**
 * File cache cleaner class
 */
class Cache_File_Cleaner {
	/**
	 * Cache directory
	 *
	 * @var string
	 */
	var $_cache_dir = '';

/**
	 * Clean operation time limit
	 *
	 * @var int
	 */
	var $_clean_timelimit = 0;

/**
	 * Exclude files
	 *
	 * @var array
	 */
	var $_exclude = array();

/**
	 * PHP5-style constructor
	 *
	 * @param array   $config
	 */
	function __construct( $config = array() ) {
		$this->_cache_dir = ( isset( $config['cache_dir'] ) ? trim( $config['cache_dir'] ) : 'cache' );
		$this->_clean_timelimit = ( isset( $config['clean_timelimit'] ) ? (int) $config['clean_timelimit'] : 180 );
		$this->_exclude = ( isset( $config['exclude'] ) ? (array) $config['exclude'] : array() );
	}

/**
	 * Run clean operation
	 *
	 * @return boolean
	 */
	function clean() {
		@set_time_limit( $this->_clean_timelimit );

$this->_clean( $this->_cache_dir, false );
	}

/**
	 * Clean
	 *
	 * @param string  $path
	 * @param bool    $remove
	 * @return void
	 */
	function _clean( $path, $remove = true ) {
		$dir = @opendir( $path );

if ( $dir ) {
			while ( ( $entry = @readdir( $dir ) ) !== false ) {
				if ( $entry == '.' || $entry == '..' ) {
					continue;
				}

foreach ( $this->_exclude as $mask ) {
					if ( fnmatch( $mask, basename( $entry ) ) ) {
						continue 2;
					}
				}

$full_path = $path . DIRECTORY_SEPARATOR . $entry;

if ( @is_dir( $full_path ) ) {
					$this->_clean( $full_path );
				} elseif ( !$this->is_valid( $full_path ) ) {
					@unlink( $full_path );
				}
			}

@closedir( $dir );

if ( $remove ) {
				@rmdir( $path );
			}
		}
	}

/**
	 * Check if file is valid
	 *
	 * @param string  $file
	 * @return bool
	 */
	function is_valid( $file ) {
		$valid = false;

if ( file_exists( $file ) ) {
			$fp = @fopen( $file, 'rb' );

if ( $fp ) {
				$expires = @fread( $fp, 4 );

if ( $expires !== false ) {
					list( , $expires_at ) = @unpack( 'L', $expires );
					$valid = ( time() < $expires_at );
				}

@fclose( $fp );
			}
		}

return $valid;
	}
}

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