<?php
header("Content-type:text/html;charset=utf-8");
$arr = array(

    ‘0‘=>array(
            ‘name‘=>‘熱菜‘,
            ‘in‘=>‘in1‘,
            ‘on‘=>‘on2‘
        ),
    ‘1‘=>array(
            ‘name‘=>‘熱菜‘,
            ‘in‘=>‘in2‘,
            ‘on‘=>‘on2‘
        ),
    ‘2‘=>array
 
(
            ‘name‘=>‘熱菜‘,
            ‘in‘=>‘in3‘,
            ‘on‘=>‘on3‘
        ),
    ‘3‘=>array(
            ‘name‘=>‘涼菜‘,
            ‘in‘=>‘in4‘,
            ‘on‘=>‘on4‘
        ),
    );

$new_name = array();
$data = array();
foreach ($arr as $key => $value) {
    if
 
($value[‘name‘]){
        $new_name[] = $value[‘name‘];
    }
}
$res = array_unique($new_name);
foreach ($res as $k => $v) {
    foreach ($arr as $kk => $vv) {
        if($v == $vv[‘name‘]){
            $data[$k][‘name‘] = $v;
            $data[$k][‘data‘][] = $arr[$kk];
        }
    }
}
print_r
 
($data);

原數組是：

合並後的數組是：

合並一個多維數組中鍵的值相同的數組