The allowsNull method look if arguments have a type.
If a type is defined, null is allowed only if default value is null.
<?php
function myfunction ( $param ) {
}
echo (new ReflectionFunction("myfunction"))->getParameters()[0]->allowsNull() ? "true":"false";
?>
Result : true
<?php
function myfunction ( stdClass $param ) {
}
echo (new ReflectionFunction("myfunction"))->getParameters()[0]->allowsNull() ? "true":"false";
?>
Result : false
<?php
function myfunction ( stdClass $param = null ) {
}
echo (new ReflectionFunction("myfunction"))->getParameters()[0]->allowsNull() ? "true":"false";
?>
Result : true
ReflectionParameter::allowsNull
(PHP 5, PHP 7)
ReflectionParameter::allowsNull — Checks if null is allowed
설명
public bool ReflectionParameter::allowsNull
( void
)
Checks whether the parameter allows NULL.
Warning
이 함수는 현재 문서화 되어있지 않습니다; 인수 목록만을 제공합니다.
인수
이 함수는 인수가 없습니다.
반환값
TRUE if NULL is allowed, otherwise FALSE
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User Contributed Notes 2 notes
Geoffrey LAURENT ¶
11 years ago
tuncdan dot ozdemir dot peng at gmail dot com ¶
10 months ago
Please note that `mixed` type parameter also returns true, as `null` is part of the `mixed` union.
And there does not have to be a default `null` value for `->allowsNull()` to return true.
function test (AnyType|null $param1, mixed $param2) {}
Both parameters from the function above will return true for `allowsNull()`.
