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array_key_exists()

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Programming Language

PHP [Versions: 4 >= 4.0.7, 5, 7, 8]

Syntax

Typical Usage

Checks if a key or index exists in a PHP array.


Accepted Parameters

  • key (string or integer) (Required): The key or index to look for.
  • array (array) (Required): The array you wish to check.

Return Value(s)

Returns true on success or false on failure.

Notes

array_key_exists() will only search the first dimension of multidimensional arrays. 

Examples of array_key_exists()

Example 1

<?php
$cats = array('lions' => 5, 'tigers' => 4, 'leopards' => '8');
if (array_key_exists('tigers', $cats)) {
     echo 'This zoo has ' . $cats['tigers'] . ' tigers.';
}

The above will output “This zoo has 4 tigers.” because the $cats array does have a ‘tigers’ key.

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