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<ReflectionTypeReflectionType::__toString>
^ReflectionTypeLast updated: Mon, 26 Oct 2026

ReflectionType::allowsNull

(PHP 7, PHP 8)

ReflectionType::allowsNull — Checks if null is allowed

Description

public function ReflectionType::allowsNull(): bool

Checks whether the parameter allows null.

Parameters

This function has no parameters.

Return Values

true if null is allowed, otherwise false

Examples

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:

bool(false)
bool(true)

See Also


<ReflectionTypeReflectionType::__toString>
^ReflectionTypeLast updated: Mon, 26 Oct 2026