function in parameter with already set parameters

index.php

<?php

$i = 1;

function plus1(int $i) {
    return $i + 1;
}

$f = function () use ($i) {
    echo plus1($i);
};

// can be used to execute the next responsibility in chain-of-responsibilities
function execute($f) {
    $f();
}

execute($f); // 2