Функция удаления файлов из директории черезопределенное время их хранения

function old ($papka , $times ){
$old_time = time ()- 60 *$times ;
$dir = opendir ( $papka );
while ( $file = readdir ( $dir )) {
if (( $file != "." ) && ( $file != ".." ))
$files []=" $papka /$file " ;
$time []= filemtime( " $papka / $file " );
}
closedir ( $dir );
$count_files = count ( $files );
for( $i = 1; $i < $count_files ; $i ++){
if( $time [ $i ] <= $old_time ){
@unlink ( $files [ $i ]);
}
}
}