`rm -r` command, PHP implementation

rm_r.php

<?php
/**
 * `rm -r` command, PHP implementation
 *
 * @since   2009-12-20
 * @license two-clause BSD
 */
function rm_r( $path ) {
  if ( is_dir( $path ) and $dh = opendir( $path ) ) {
    while ( ($entry = readdir( $dh )) !== false ) {
      if ( !preg_match( '/\A\.\.?\z/', $entry ) ) {
        $p = $path.DIRECTORY_SEPARATOR.$entry;
        if ( is_dir( $p ) ) {
          rm_r( $p );
        } else {
          unlink( $p );
        }
      }
    }
    closedir( $dh );
    rmdir( $path );
    return true;
  } else {
    return false;
  }
}