两个数组循环对比方法

$new_res = db()->query($sql);

$old_res = db()->query($sql);

result = array();

foreach($old_res as $old_v){
    $result[$old_v['account_number']] = $old_v;
}
$i = 0;
foreach($new_res as $key => $value){
     if($result[$value['account_number']]['year'] == $value['year']  &&
        $result[$value['account_number']]['month'] == $value['month'] &&
        $result[$value['account_number']]['already_num'] == $value['already_num'] &&
        $result[$value['account_number']]['status'] == $value['status']
     ){ 


}

上面的适应key唯一的情况

$result[$old_v['account_number']] = $old_v;

如果key不唯一，需要用

$result[$old_v['account_number']][] = $old_v;

见下面例子：

$books = [
[
'name'=>'a',
'type'=>1,
'price'=>100
],
[
'name'=>'b',
'type'=>2,
'price'=>200
],
[
'name'=>'c',
'type'=>1,
'price'=>150
]
];

$result = [];
foreach($books as $key=>$value){
$result[$value['type']][] = $value;
}