<?php

$foo = function (int $val1, float $val2) : string {
    dump($val1, $val2);
    return $val1 + $val2;
};

dump($foo('4', 6));


^ 4

^ 6.0

^ "10"

• Using RegexIterator to filter values of collection
• Introduced in PHP 7: IntlChar class containing static methods for characters
• SplFixedArray - A fixed array structure similar to other languages

PHP 8.0, Laminas MVC 3.2, Symfony 5.2, Laravel 8.28, PHPUnit 9.5, Doctrine ORM 2.8