PHP中二维数组排序有关问题

	$person = array(		array('num'=>'001','id'=>6,'name'=>'zhangsan','age'=>21),		array('num'=>'001','id'=>7,'name'=>'ahangsan','age'=>23),		array('num'=>'003','id'=>1,'name'=>'bhangsan','age'=>23),		array('num'=>'001','id'=>3,'name'=>'dhangsan','age'=>23),	);

	//负数或者false表示第一个参数应该在前	function sort_by_name($x,$y){		return strcasecmp($x['name'],$y['name']);	}

uasort($person,'sort_by_name');

	//$array 要排序的数组	//$row   排序依据列	//$type  排序类型[asc or desc]	//return 排好序的数组	function array_sort($array,$row,$type){		$array_temp = array();		foreach($array as $v){			$array_temp[$v[$row]] = $v;		}		if($type == 'asc'){			ksort($array_temp);		}elseif($type='desc'){			krsort($array_temp);		}else{					}		return $array_temp;	}