ReflectionParameter::allowsNull
(PHP 5, PHP 7, PHP 8)
ReflectionParameter::allowsNull — Checks 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
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User Contributed Notes 1 note
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
备份地址：http://www.lvesu.com/blog/php/reflectionparameter.allowsnull.php