(PHP 7)
ReflectionType::allowsNull — Checks if null is allowed
Checks whether the parameter allows NULL.
This function has no parameters.
TRUE if NULL is allowed, otherwise FALSE
Example #1 ReflectionType::allowsNull() example
<?php
function someFunction(string $param, StdClass $param2 = null) {}
$reflectionFunc = new ReflectionFunction('someFunction');
$reflectionParams = $reflectionFunc->getParameters();
var_dump($reflectionParams[0]->getType()->allowsNull());
var_dump($reflectionParams[1]->getType()->allowsNull());
The above example will output something similar to:
bool(false) bool(true)