PHP two-dimensional array add to modify two-dimensional array data

1. Foreach loop addition and modification

foreach ($res as $k => $v) {
    
    
	$res[$k]['time'] = date('Y-M-D',$v['time']);
}

2. Circular reference addition and modification

foreach ($res as $k => &$v) {
    
    
	$v['time'] = date('Y-M-D',$v['time']);
}

3. Use array_walk to add and modify

array_walk($res,function (&$v) {
    
    
   $v['time'] = date('Y-M-D',$v['time']);//方式1
   $v = array_merge($v,['time'=>date('Y-M-D',$v['time'])]);//方式二
});