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# array_key_exists

(PHP 4 >= 4.1.0)

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

## Description

bool array_key_exists ( mixed key, array search)

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

Example 1. array_key_exists() example
    $search_array = array("first" => 1, "second" => 4);
    if (array_key_exists("first", $search_array)) {
        echo "The 'first' element is in the array";
    }

> Note: The name of this function is key_exists() in PHP version 4.0.6.

See also isset().

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