PHP array_​key_​last() Function

The array_​key_​last() function is an inbuilt function in PHP that is used to get the last key of an array. This function returns the last key without affecting the internal array pointer.

Syntax:

int|string|null array_​key_​last(array $array)

Parameters: This function accepts single parameter $array that holds the array element.

Return Value: This function returns the last key of the array if the array is not empty, and null otherwise.

Example 1:

PHP

<?php

$arr = array();

var_dump(array_key_last($arr));

$arr1 = array("10", "20", "30", "40", "50");
var_dump(array_key_last($arr1));

?>

Output:

NULL
int(4)

Example 2:

PHP

<?php

$arr = array(
    'Geeks'  => "HTML",
    'GFG'  => "CSS",
    'Geek'  => "JavaScript",
    'G4G' => "PHP"
);

var_dump(array_key_last($arr));

$arr1 = array(
    5 => "geeks",
    10 => "GFG"
);

var_dump(array_key_last($arr1));

?>

Output:

string(3) "G4G"
int(10)

Reference: https://www.php.net/manual/en/function.array-key-last.php