Checks if the function has a specified return type

ReflectionFunctionAbstract::getStaticVariables
ReflectionFunctionAbstract::inNamespace
ReflectionFunctionAbstract
PHP Manual

# ReflectionFunctionAbstract::hasReturnType

(PHP 7)

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

### Description

public bool ReflectionFunctionAbstract::hasReturnType ( void )

Checks whether the reflected function has a return type specified.

### Parameters

This function has no parameters.

### Return Values

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

### Examples

Example #1 ReflectionFunctionAbstract::hasReturnType() example

`<?php
function to_int($param) : int {
return (int) $param;
}
$reflection1 = new ReflectionFunction('to_int');
var_dump($reflection1->hasReturnType());`

The above example will output:

    bool(true)

Example #2 Usage on built-in functions

`<?php
$reflection2 = new ReflectionFunction('array_merge');
var_dump($reflection2->hasReturnType());`

The above example will output:

    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.

### See Also

- ReflectionFunctionAbstract::getReturnType() - Gets the specified return type of a function

ReflectionFunctionAbstract::getStaticVariables
ReflectionFunctionAbstract::inNamespace
ReflectionFunctionAbstract
PHP Manual