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ReflectionParameter::allowsNull

(PHP 5, PHP 7, PHP 8)

ReflectionParameter::allowsNullChecks if null is allowed

说明

public ReflectionParameter::allowsNull(): bool

Checks whether the parameter allows null.

参数

此函数没有参数。

返回值

true if null is allowed, otherwise false

参见

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User Contributed Notes 1 note

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15
Geoffrey LAURENT
9 years ago
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
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