<?php

use Webmozart\Assert\Assert;

class Foo
{
    public function intOnly(int $value) : int
    {
        Assert::greaterThan($value, 0, '%s is not greater than 0');
        Assert::lessThan($value, 10, '%s is not lower than 10');
        
        return $value;
    }
    
    public function exactlyTheAnswer($value) : int
    {
        Assert::eq($value, 42, '%s is not the right answer.');
        return $value;
    }
    
    public function sum($collection) : int
    {
        Assert::isTraversable($collection, '%s is not an array or traversable');
        $result = 0;
        foreach ($collection as $value) {
            Assert::integerish($value, '%s? We want integer!');
            $result += $value;
        }
        
        return $result;
    }
}

$foo = new Foo();

try {
    $foo->intOnly(10);
} catch (Exception $e) {
    dump($e->getMessage());
}


try {
    $foo->exactlyTheAnswer(7);
} catch (Exception $e) {
    dump($e->getMessage());
}



try {
    $foo->sum([1, 1, 'a']);
} catch (Exception $e) {
    dump($e->getMessage());
}

try {
    $foo->sum(4);
} catch (Exception $e) {
    dump($e->getMessage());
}

^ "10 is not lower than 10"

^ "7 is not the right answer."

^ "string? We want integer!"

^ "integer is not an array or traversable"

• Serialization to XML with JMS Serializer
• Creating and using Twig functions
• Create a json schema to validate against

PHP 8.3, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8