array_key_exists()

array_key_exists - Checks if the given key or index exists in the array

Syntax

bool array_key_exists (mixed $key, array $search)

Arguments

• key - Value to check.
• search - An array with keys to check.

Description

array_key_exists() returns TRUE if the given key is set in the array. key can be any value possible for an array index.

Version

PHP 4.0.7, 5

Return value

Returns TRUE on success or FALSE on failure.