3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php class Foo { public function __construct() { echo 'created!'; } } class Bar { protected $foo; public function getFoo() { return $this->foo ?? ($this->foo = new Foo); } } $bar = new Bar; var_dump($bar->getFoo(), $bar->getFoo(), $bar->getFoo());
based on l0Ccd
Output for 7.0.0 - 7.2.0
created!object(Foo)#2 (0) { } object(Foo)#2 (0) { } object(Foo)#2 (0) { }
Output for 5.3.19 - 5.6.28
Parse error: syntax error, unexpected '?' in /in/Rkj5M on line 17
Process exited with code 255.