3v4l.org

run code in 300+ PHP versions simultaneously
<?php class IAmImmutable { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } $object = new IAmImmutable('Peter'); var_dump($object->getName()); $object->__construct('Bob'); var_dump($object->getName());
Output for 5.5.0 - 5.5.36, 5.6.0 - 5.6.22, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
string(5) "Peter" string(3) "Bob"

preferences:
198.49 ms | 404 KiB | 215 Q