ReflectionFunctionAbstract::hasReturnType

(PHP 7, PHP 8)

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

Description

public ReflectionFunctionAbstract::hasReturnType(): bool

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

<?phpfunction 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