(PHP 5)
ReflectionParameter::allowsNull — Checks if null is allowed
Checks whether the parameter allows NULL.
本函数还未编写文档，仅有参数列表。
此函数没有参数。
TRUE if NULL is allowed, otherwise FALSE
Geoffrey LAURENT (2013-05-05 15:53:08)
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