Wrong response from PHP Closure

Question

I trying to understand closures more but I cannot get the correct response from the below code. I get a response of 31 instead of 60 for some reason. My aim is to eventually start unit testing closures.

Thanks


<?php


class Closuretest
{

    /**
     * Closuretest constructor.
     */
    public function __construct()
    {
    }

    /**
     * @return mixed
     */
    public function getToken()
    {


            $response = $this->getEntry('abcde', function() {
                return 30;
            }, 30);

        // Return access token
        return $response;
    }


    /**
     * @param $a
     * @param $b
     * @param $c
     * @return mixed
     */
    private function getEntry($a, $b, $c)
    {
        return $b+$c;
    }

}

$testinstance = new Closuretest();

echo $testinstance->getToken();

on getEntry method, you are getting the sum of $b and $c. You passed a closure on the second argument so it becomes closure + 30. If you allow notices in your error verbosity you will get a PHP Notice: Object of class Closure could not be converted to int notice, and interprets the closure as 1, that's why you're getting 31. — rai
– rai, Commented Apr 19, 2021 at 19:21

Syscall · Accepted Answer · 2021-04-19 19:20:37Z

3

In the function getEntry(), $b is not an integer, but a function. You need to execute this function by calling $b() to get the result:

private function getEntry($a, $b, $c)
{
    return $b() + $c; // instead of `$b + $c`
}

Here, $b() will return 30, and $c is equal to 30. So, getEntry() will return 60.

answered Apr 19, 2021 at 19:20

Syscall

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