<?php

use SuperClosure\SerializableClosure;

$hello = function($world) {
    echo 'Hello ' . $world;
};

// A Closure cannot be serialized
try {
    serialize($hello);
}
catch(Exception $e) {
    echo $e->getMessage() . PHP_EOL . PHP_EOL;
}

$closurer = new SerializableClosure($hello);

$serialized = serialize($closurer);
$unserialized = unserialize($serialized);

$unserialized('world');

Serialization of 'Closure' is not allowed

Hello world

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PHP 7.3, Zend 3.0, Symfony 4.3, Laravel 5.8, PHPUnit 8.0, Doctrine 2.10