PHP: List recursive all folders

listdir.php

function listdir($dir) {
	
	$current_dir = opendir( $dir );
	while ( $entryname = readdir( $current_dir ) ) {
		if( is_dir( "$dir/$entryname" ) and ($entryname != "." and $entryname != "..") ) {
			listdir( "${dir}/${entryname}" );
		} elseif( $entryname != "." and $entryname != ".." ) {
			unlink( "${dir}/${entryname}" );
		}
	}
	@closedir( $current_dir );
	rmdir( ${dir} );
}