array_key_first

(PHP 7 >= 7.3.0)

array_key_firstGets the first key of an array

Descrierea

array_key_first ( array $array ) : mixed

Get the first key of the given array without affecting the internal array pointer.

Parametri

array

An array.

Valorile întoarse

Returns the first key of array if the array is not empty; NULL otherwise.

Exemple

Example #1 Basic array_key_first() Usage

<?php
$array 
= ['a' => 1'b' => 2'c' => 3];

$firstKey array_key_first($array);

var_dump($firstKey);
?>

Exemplul de mai sus va afișa:

string(1) "a"

A se vedea și

  • array_key_last() - Gets the last key of an array
  • reset() - Set the internal pointer of an array to its first element