update : 2015.11.03
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Checks if the function has a specified return type
ReflectionFunctionAbstract
PHP Manual

ReflectionFunctionAbstract::hasReturnType

(PHP 7)

ReflectionFunctionAbstract::hasReturnType — Checks if the function has a specified return type

설명

public bool ReflectionFunctionAbstract::hasReturnType ( void )

Checks whether the reflected function has a return type specified.

인수

이 함수는 인수가 없습니다.

반환값

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

예제

Example #1 ReflectionFunctionAbstract::hasReturnType() example

<?php

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

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

위 예제의 출력:

bool(true)

Example #2 Usage on built-in functions

<?php

$reflection2 = new ReflectionFunction('array_merge');

var_dump($reflection2->hasReturnType());

위 예제의 출력:

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.

참고

ReflectionFunctionAbstract
PHP Manual