$old_val = [
['id'=>22,'num'=>1],
['id'=>24,'num'=>2]
];
$new_val = [
['id'=>22,'num'=>1,'kw'=>40s],
['id'=>24,'num'=>2,'kw'=>40],
['id'=>26,'num'=>1,'kw'=>40]
];
我想比較兩個不同元素的多維陣列，組成一個新的這種格式陣列，插入資料庫。該怎么做？
$new_arr = [
['field_name'=>'id','old_val'=>22,'new_val'=>22],['field_name'=>'num','old_val'=>1,'new_val'=>1],['field_name'=>'kw','old_val'=>'','new_val'=>40s],
['field_name'=>'id','old_val'=>24,'new_val'=>24],['field_name'=>'num','old_val'=>2,'new_val'=>2],['field_name'=>'kw','old_val'=>'','new_val'=>40],
['field_name'=>'id','old_val'=>26,'new_val'=>26],['field_name'=>'num','old_val'=>'','new_val'=>1],['field_name'=>'kw','old_val'=>'','new_val'=>40]
];
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