1207.php

<?php
echo 'Explain the Closure';

$fun = function ($money) {
    return 'Do fun with $' . $money;
};

$panelty = function ($money) {
    return 'Pay fine of $' . $money;
};
// echo $panelty(400);
var_dump($fun);
// echo $fun; //this will return error that obj cant be convert into string. but $fun is fn. how it is object? it is obj is default php class closure. it will automatically marked as object of default php closure class.

$joy = function ($a, $b, Closure $callback) {
    $m = $a * $b;
    return $callback($m);
};

echo $joy(20, 5, $fun);
// var_dump($joy);  //this is also object of closure class. bcz $joy is ananymous fun().