function array_sort($array, $on, $order=SORT_ASC) { $new_array = array(); $sortable_array = array();

    foreach ($array as $k => $v) {
		if (is_array($v)) {
			foreach ($v as $k2 => $v2) {
				if ($k2 == $on) {						      
	      	    $sortable_array[$k] = $v2;
	       		}
			}
		} else {
			$sortable_array[$k] = $v;
		}		  
    }
    switch ($order) {
        case SORT_ASC:
            asort($sortable_array);                   
        break;
        case SORT_DESC:
            arsort($sortable_array);
        break;
    }
    foreach ($sortable_array as $k => $v) {
        $new_array[$k] = $array[$k];
    }
    return $new_array;
}

다른 function에서 호출해서 사용 something like it
if( $this->sort == '-name' ){				
	rsort($dirs);
	rsort($files);
} else if( $this->sort == '+datetime' ){
	$files = $this->array_sort($content['files'], 'datetime');
} else if( $this->sort == '-datetime' ){				
	$files = $this->array_sort($content['files'], 'datetime', SORT_DESC);
} else if( $this->sort == '+size' ){
	$files = $this->array_sort($content['files'], 'size');
} else if( $this->sort == '-size' ){				
	$files = $this->array_sort($content['files'], 'size', SORT_DESC);
} else {
	sort($dirs);
	sort($files);
}