PHP deletes the element with the specified subscript in the array method php example

The editor below will share with you a PHP method for deleting elements with a specified subscript in an array. It has a good reference value and I hope it will be helpful to everyone. Let's follow the editor and take a look.

1. Previously, we talked about the deletion of elements when the array is used as a stack or queue, that is, deletion is done in order and regularly. So, what should you do if you need to delete an element from the middle of the array? We need the unset() function we are going to talk about today.

2. The unset() function allows you to cancel elements in an array, but the array will not re-index, that is, the original index will be maintained, because the index in PHP has a special meaning.

3. Example display:

<?php 
  $arr = array(1=>&#39;one&#39;,2=>&#39;two&#39;,3=>&#39;three&#39;); 
    
  //删除下标为2的元素 
  unset($arr[2]); //将得到Array(1=>&#39;one&#39;,3=>&#39;three&#39;) 
 
  //使用array_values()重新建立索引 
  $aar = array_values($arr); //$aar = array(0=>&#39;one&#39;,1=>&#39;three&#39;) 
?>

4. The last line of code in the above example is to re-establish the array index. Here I explain it as follows: Because after using the unset() function to delete an element, the index subscript order is not re-established. If you need sequential index subscripts, you can use the array_values() function to recreate the index subscript order.

Note: The re-indexing mentioned here means: re-creating a sequential subscript starting from 0. Even if your index is not named with a number, it will be re-indexed.

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