php 根据相同值在分组

$arr    =   array
(
    0 => array
        (
            'initial' => 'A',
            'typename' => '奥迪'
        ),
    1 => array
        (
            'initial' => 'F',
            'typename' =>'F1'
        ),
    2 => array
        (
            'initial' => 'F',
            'typename' => 'F2'
        )
);
$result =   array();
foreach($arr as $k=>$v){
    $result[$v['initial']][]    =   $v;
}
 
//得到的$result就包括你需要的内容了