PHP 8 reference · Array Functions

PHP array_key_last() Function

Return the last key of an array without moving its internal pointer, or null for an empty array. Added in 7.3.

PHP 8 Since 7.3

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Syntax

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

Parameter	Description
`array`	The input array.

The last key, or null.

Last key and valueTry it yourself

<?php
$steps = ["start", "middle", "end"];
echo array_key_last($steps), "\n";
echo $steps[array_key_last($steps)], "\n";

Output

2
end

Spot the last item in a loopTry it yourself

<?php
$items = ["a", "b", "c"];
$last = array_key_last($items);
foreach ($items as $i => $item) {
    echo $item, $i === $last ? "\n" : ", ";
}

Output

a, b, c

Version	Change
PHP 7.3	Added

array_key_first() · Return the first key of an array without moving its internal pointer, or null for an empty array. Added in 7.3.
array_last() · Return the last value of an array, or null if it's empty, without touching the internal pointer. Added in PHP 8.5.
count() · Return the number of elements in an array or Countable object. With COUNT_RECURSIVE it also counts nested elements.
PHP Arrays · tutorial
PHP Array Functions · tutorial