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$id=12;
$arr=[1,2];
array_walk($arr,function($value,$key) use($id){
$arr[$key]['group_id']=$value;
$arr[$key]['mid']=$id;
});
$id=12;
$arr=[1,2];
array_walk($arr,function(&$value,$key) use($id){
$value = ['group_id' => $value, 'mid' => $id];
});
print_r($arr);
Array
(
[0] => Array
(
[group_id] => 1
[mid] => 12
)
[1] => Array
(
[group_id] => 2
[mid] => 12
)
)