ReflectionFunctionAbstract
PHP Manual

ReflectionFunctionAbstract::hasReturnType

Checks if the function has a specified return type

Description

public bool ReflectionFunctionAbstract::hasReturnType()

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