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PHP array_key_last() Function

Quick summary: The PHP array_key_last() function returns the last key of an array without modifying the internal pointer.

PHP array_key_last() Syntax 

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

PHP array_key_last() Basic examples 

$array = ['x'=>1,'y'=>2];
echo array_key_last($array);
PHP
Output:
y

Returns the last key of the array.

PHP array_key_last() Real-world usage 

$log = ['start'=>true,'process'=>true,'end'=>true];
$lastStep = array_key_last($log);
echo $lastStep;
PHP
Output:
end

Useful for retrieving the most recent element key.

PHP array_key_last() Edge cases 

$empty = [];
var_dump(array_key_last($empty));
PHP
Output:
NULL

Returns null for empty arrays.

PHP array_key_last() Common mistakes

Using end() unnecessarily

array_key_last() does not move the internal pointer.

Incorrect
end($array);
$key = key($array);
Correct
$key = array_key_last($array);

Use array_key_last() for cleaner and safer access.

PHP array_key_last() Frequently Asked Questions

What does array_key_last() do?

Returns the last key of an array.

Use case?

Access last element.

Return value?

Key or null.

Introduced in PHP?

PHP 7.3.

Common mistake?

Using end().

Performance?

Fast.

Safe?

Yes.

Handles empty array?

Returns null.

Alternative?

array_keys()[count-1].

Modifies array?

No.

Best practice?

Use built-in function.

Used in iteration?

Yes.

PHP array_key_last() Related PHP Functions