WP_Filesystem_Base::getnumchmodfromh( string $mode )

	public function getnumchmodfromh( $mode ) {
		$realmode = '';
		$legal =  array('', 'w', 'r', 'x', '-');
		$attarray = preg_split('//', $mode);

		for ( $i = 0, $c = count( $attarray ); $i < $c; $i++ ) {
		   if ($key = array_search($attarray[$i], $legal)) {
			   $realmode .= $legal[$key];
		   }
		}

		$mode = str_pad($realmode, 10, '-', STR_PAD_LEFT);
		$trans = array('-'=>'0', 'r'=>'4', 'w'=>'2', 'x'=>'1');
		$mode = strtr($mode,$trans);

		$newmode = $mode[0];
		$newmode .= $mode[1] + $mode[2] + $mode[3];
		$newmode .= $mode[4] + $mode[5] + $mode[6];
		$newmode .= $mode[7] + $mode[8] + $mode[9];
		return $newmode;
	}