PHP 7.4.0RC4 Released!

ReflectionFunctionAbstract::hasReturnType

(PHP 7)

ReflectionFunctionAbstract::hasReturnTypeChecks if the function has a specified return type

説明

public ReflectionFunctionAbstract::hasReturnType ( void ) : bool

Checks whether the reflected function has a return type specified.

パラメータ

この関数にはパラメータはありません。

返り値

Returns TRUE if the function is a specified return type, otherwise FALSE.

例1 ReflectionFunctionAbstract::hasReturnType() example

<?php

function to_int($param) : int {
    return (int) 
$param;
}

$reflection1 = new ReflectionFunction('to_int');
var_dump($reflection1->hasReturnType());

上の例の出力は以下となります。

bool(true)

例2 Usage on built-in functions

<?php

$reflection2 
= new ReflectionFunction('array_merge');

var_dump($reflection2->hasReturnType());

上の例の出力は以下となります。

bool(false)

This is because many internal functions do not have types specified for their parameters or return values. It is therefore best to avoid using this method on built-in functions.

参考

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top