3v4l.org

run code in 500+ PHP versions simultaneously
<?php trait Foo {public $var = [];} trait Bar {private $var = [];} class Baz {use Foo, Bar;}
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26
Fatal error: Foo and Bar define the same property ($var) in the composition of Baz. However, the definition differs and is considered incompatible. Class was composed in /in/brZt0 on line 5
Output for 8.5.0 - 8.5.11
Fatal error: Foo and Bar define the same property ($var) in the composition of Baz. However, the definition differs and is considered incompatible. Class was composed in /in/brZt0 on line 5 Stack trace: #0 {main}
preferences:
33.03 ms | 1140 KiB | 9 Q