ReflectionFunctionAbstract::getReturnType

(PHP 7)

ReflectionFunctionAbstract::getReturnType — Gets the specified return type of a function

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public ReflectionFunctionAbstract::getReturnType ( void ) : ReflectionType

Gets the specified return type of a reflected function.

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Returns a ReflectionType object if a return type is specified, NULL otherwise.

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Example #1 ReflectionFunctionAbstract::getReturnType() example

<?php

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

$reflection1 = new ReflectionFunction('to_int');
echo $reflection1->getReturnType();

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int

Example #2 Usage on built-in functions

<?php

$reflection2 = new ReflectionFunction('array_merge');

var_dump($reflection2->getReturnType());

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null

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.

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