How to Retrieve the Last Key in a PHP Array?

Retrieving the Last Key in an Array

In the realm of PHP arrays, accessing the last key can be a useful task. This guide will explore how to accomplish this with a combination of the end() and key() functions:

Understanding the Approach:

• end() advances the array's internal pointer to the last element, simultaneously returning its value.
• key() retrieves the index of the current array position, including the element pointed to by the internal pointer.

Code Snippet:

Consider the following portion of code as an example:

<code class="php">$array = array(
    'first' => 123,
    'second' => 456,
    'last' => 789, // Last element in the array
);

end($array); // Move the pointer to the last element
$key = key($array); // Capture the key of the last element

var_dump($key); // Output: 'last'</code>

Explanation:

By calling end() on the $array, the internal pointer is positioned at the last element with a value of 789. Subsequently, using key(), we retrieve the key associated with this element, which is 'last'. This key is the last key in the array.

Note:

After retrieving the last key, the internal pointer remains at the end of the array. To reset the pointer to the beginning, consider using the reset() function.

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