array_key_exists

Checks if the given key or index exists in the array (PHP 4 >= 4.1.0)
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 117. array_key_exists() example

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<?php
$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(), array_keys(), and in_array().

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