3v4l.org

run code in 300+ PHP versions simultaneously
<?php class User { public $address; } class Address { public $street; } function old($key, $default) { var_dump($default); } $address = new Address(); $address->street = 'Street'; $user = new User(); $user->address = $address; old('address', $user->address ?? '');
Output for 7.1.0 - 7.1.20, 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 - 8.3.4, 8.3.6
object(Address)#1 (1) { ["street"]=> string(6) "Street" }
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 object(Address)#1 (1) { ["street"]=> string(6) "Street" }

preferences:
170.81 ms | 402 KiB | 159 Q