array_key_exists

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Checks if the given key or index exists in the array

array_key_exists ( mixed $key , array $array ) : bool

key

Value to check.

array

An array with keys to check.

Returns TRUE on success or FALSE on failure.

<?

$key = 1;
$array = array(0, 1);

$return = array_key_exists($key, $array);

var_export($return);

?>

true

<?

$key = "b";
$array = array("a" => 0, "b" => 1);

$return = array_key_exists($key, $array);

var_export($return);

?>

true

<?

$key = 1;
$array = array(0, null);

$return = array_key_exists($key, $array);

var_export($return);

?>

true

<?

$key = "b";
$array = array("a" => 0, "b" => null);

$return = array_key_exists($key, $array);

var_export($return);

?>

true

PHP