150.php 多维数组排序

<?phpecho '<pre>';$arr = array(    array(        'a'=>'aaa',        'flag'=>1    ),    array(        'b'=>'bbb',        'flag'=>4,    ),    array(        'c'=>'ccc',        'flag'=>3    ));$a = usort($arr,function($arr1,$arr2){    if ($arr1['flag'] > $arr2['flag']) {        return -1;    } else {        return 1;    }});var_dump($arr);

http://www.w3school.com.cn/php/php_arrays_sort.asp

http://www.jb51.net/article/44844.htm