What is the array_key_last method in PHP?

The array_key_last can be used to get the last key of the array.

Syntax

array_key_last(array $array): int|string|null

If the passed array doesn’t have any element, then it returns null.

Example

<?php
$arr = [
            'ONE' => 1, 
            'TWO' => 2, 
            'THREE' => 3
          ];
$lastKey = array_key_last($arr);
echo "The last key of the array is :". $lastKey;
?>

In the code above, We have created an array and get the last key of the array using the array_key_last method.

Example 2

Let’s call array_key_last on an empty array:

<?php
  $arr = [];
  $lastKey = array_key_last($arr);
  var_dump($lastKey);
?>

In the code above, we will get NULL as a result because the passed array is empty.

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