Skip to content
Related Articles

Related Articles

PHP array_​key_​first() Function

Improve Article
Save Article
  • Last Updated : 22 Jul, 2022
Improve Article
Save Article

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

Syntax:

int|string|null array_key_first(array $array)

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

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

Example 1:

PHP




<?php
  
$arr = array();
  
var_dump(array_key_first($arr));
  
$arr1 = array("10", "20", "30", "40", "50");
var_dump(array_key_first($arr1));
  
?>


Output:

NULL
int(0)

Example 2:

PHP




<?php
  
$arr = array(
    'Geeks'  => "HTML"
    'GFG'  => "CSS"
    'Geek'  => "JavaScript"
    'G4G' => "PHP"
);
  
var_dump(array_key_first($arr));
  
$arr1 = array(
    5 => "geeks",
    10 => "GFG"
);
  
var_dump(array_key_first($arr1));
  
?>


Output:

string(5) "Geeks"
int(5)

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


My Personal Notes arrow_drop_up
Related Articles

Start Your Coding Journey Now!