Dai Chong's blog
原数据
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$arr    =   array
(
    0 => array
    (
        'initial' => 'A',
        'typename' => '奥迪'
    ),
    1 => array
    (
        'initial' => 'F',
        'typename' =>'F1'
    ),
    2 => array
    (
        'initial' => 'F',
        'typename' => 'F2'
    )

);
[合并代码]
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$result =  array();
foreach($arr as $k=>$v){
    $result[$v['initial']][] = $v;
}
[分组后的数组]
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Array
(
    [A] => Array
    (
        [0] => Array
        (
            [initial] => A
            [typename] => 奥迪
         )

        )

    [F] => Array
    (
        [0] => Array
        (
            [initial] => F
            [typename] => F1
        )

        [1] => Array
        (
            [initial] => F
            [typename] => F2
         )

       )

)

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