How to change the original array while adding & traversing to foreach in PHP

If I want to change a certain value of the array and traverse it directly, the original array will not change. Here are two methods

1. We can combine the data when traversing and then array_push() the data Assign it to another new array like this:

$data=array(1,2,3,4);
$newdata=array();
foreach($data as $k=>$v){
    if($v==2)  $v=666;//我们想把值等于2的改为666 这样的话在内部改变了$v但是$data还是没改变
    array_push($newdata,$v);//这样可以得到我们想要的数组
      }

2. We can add an & symbol in front of the traversed value so that the original array can be changed without using array_push()

$data=array(1,2,3,4);
foreach($data as &$v){
      if($v==2)  $v=666;//因为$v前面加了'&'所以原数组就直接改变了
}

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