根据数组中某一字段排序

function arraySort($array,$keys,$sort='asc') {
    $newArr = $valArr = array();
    foreach ($array as $key=>$value) {
        $valArr[$key] = $value[$keys];
    }
    ($sort == 'asc') ?  asort($valArr) : arsort($valArr);
    reset($valArr);
    foreach($valArr as $key=>$value) {
        $newArr[$key] = $array[$key];
    }
    return array_merge($newArr);
}