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Cache_File_Cleaner.php
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Cache_File_Cleaner.php
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<?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;
}
}