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, PHP 8)
ReflectionParameter::allowsNull — Checks if null is allowed
Descrizione
Checks whether the parameter allows null.
Elenco dei parametri
Questa funzione non contiene parametri.
Valori restituiti
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 ¶
8 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()`.
