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)
ReflectionParameter::allowsNull — Checks if null is allowed
說明
public bool ReflectionParameter::allowsNull
( void
)
Checks whether the parameter allows NULL.
Warning
此函式目前沒有參考文件；只有引數列表。
參數
此函式沒有參數。
回傳值
TRUE if NULL is allowed, otherwise FALSE
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User Contributed Notes 1 note
Geoffrey LAURENT ¶
11 years ago
