unction that demonstrates how to use closures to generate blocks of independent logic without extracting things into separate methods/functions. This avoids fragmentation of the code and allows to keep the logic in one place if the pieces are not reused/reusable, but still allows for save scoping. As explained by Brian Will: https://youtu.be/QM1…

Encapsulating independent scopes within a single function.php

<?php

/**
 * Function that demonstrates how to use closures to generate blocks of independent logic without extracting things into separate methods/functions.
 * 
 * This avoids fragmentation of the code and allows to keep the logic in one place if the pieces are not reused/reusable, but still allows for save scoping.
 * 
 * As explained by Brian Will:
 * https://youtu.be/QM1iUe6IofM?t=2255
 */
function longFunction(): string
{
    // 1. do something
    $resultOne = (function ()  {
        // this is a safe block of code that can be executed without poluting the outer scope
        $localVariable = 'foo';
        return 'result1';
    })();

    // 2. do something else
    $resultTwo = (function () use ($resultOne) {
        // explicitly only $resultOne is available from the outer scope
        $localVariable2 = 'foo2';
        return $resultOne.'result2';
    })();
    
    // 3. do something that results in two variables
    [$resultThree, $resultFour] = (function () use ($resultOne, $resultTwo) {
        // do work here by also using $resultOne and $resultTwo from previous steps
    	return ['three', 'four'];
    })();

    return $resultTwo . $resultThree . $resultFour;
}

echo longFunction();