3v4l.org

run code in 300+ PHP versions simultaneously
<?php namespace A\B { class C { } } namespace { $name = "A\\B\\C"; print_r(new $name()); }
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.17 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
A\B\C Object ( )

preferences:
166.53 ms | 404 KiB | 211 Q