数组按指定元素key值分组
/*数组按指定元素key值分组
* @param $dataArr array 原二组数组
* @param $keyStr string 指定元素key值
* @return array
*/
public function dataGroup($dataArr,$keyStr)
{
$newArr=[];
foreach ($dataArr as $k => $val) {
$newArr[$val[$keyStr]][] = $val;
}
return $newArr;
}