(PHP 7)
ReflectionType::allowsNull — Checks if null is allowed
public ReflectionType::allowsNull ( ) : bool
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)
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https://www.php.net/manual/en/reflectiontype.allowsnull.php