php多维数组排序

	/**
	* @param array $list 要排序的数组
	* @param string $sort_key  要按照排序的字段
	* @param $order 排序方式，省略默认降序  降序SORT_DESC   升序  SORT_ASC
	* @return array 返回排序后的数组
	*/
	function getSort($list,$sort_key,$order=SORT_DESC){
		if(!is_array($list)){
			return $list;
		}
		$key_array = array();
		foreach($list as $v){
			$key_array[] = $v[$sort_key];
		}
		array_multisort($key_array,$order,$list);
		return $list;
	}

<?php
    header('Content-type:text/html;charset=utf-8');
    $list = array(
&#160;&#160; &#160;    array('name'=>'张三','age'=>111,'grade'=>'60'),
&#160;&#160; &#160;&#160;&#160; &#160;array('name'=>'李四','age'=>12,'grade'=>'80'),
&#160;&#160; &#160;&#160;&#160; &#160;array('name'=>'王五','age'=>21,'grade'=>'50'),
&#160;&#160; &#160;&#160;&#160; &#160;array('name'=>'王五','age'=>3,'grade'=>'50'),
    );
    $list = getSort($list,'age',SORT_ASC);
    var_dump($list);
?>