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
Description
public ReflectionParameter::allowsNull
( void
) : bool
Checks whether the parameter allows NULL.
Warning
This function is currently not documented; only its argument list is available.
Parameters
This function has no parameters.
Return Values
TRUE if NULL is allowed, otherwise FALSE
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User Contributed Notes 1 note
Geoffrey LAURENT ¶
6 years ago
