PHP example code to delete specified subscript elements in an array

1. Previously, we talked about the deletion operation of elements when the array is used as a stack or queue, that is, deletion is performed 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.

This article mainly shares with you a PHP method to delete elements with specified subscripts in an array. It has a good reference value and I hope it will be helpful to everyone. Let’s follow the editor to take a look, I hope it can help everyone.

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 the following: because unset is used After the () function deletes an element, it does not re-establish the index subscript order. 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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