3v4l.org

run code in 300+ PHP versions simultaneously
<?php class Foo { public function __construct() { echo 'created!'; } } class Bar { protected $foo; public function getFoo() { return $this->foo ?? ($this->foo = new Foo); } } var_dump((new Bar)->getFoo());
Output for 7.0.0 - 7.0.32, 7.1.0 - 7.1.24, 7.2.0 - 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
created!object(Foo)#2 (0) { }
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38
Parse error: syntax error, unexpected '?' in /in/l0Ccd on line 17
Process exited with code 255.
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239.05 ms | 402 KiB | 289 Q