$var = null; if(checkNull($var)) { echo "Variable is null"; } else { echo "Variable is not null"; }
$array = array("foo" => "bar", "baz" => null); if(checkNull($array["baz"])) { echo "Array element is null"; } else { echo "Array element is not null"; }Output: Array element is null Package library: The checkNull function is a built-in function in PHP and does not require any external package or library.