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run code in 300+ PHP versions simultaneously
<?php class Email { public function subject(string|\Stringable $bar) {} } class CustomEmail extends Email { public function subject(string $bar) {} }
Output for 8.2.0 - 8.2.28, 8.3.0 - 8.3.19, 8.4.1 - 8.4.5
Fatal error: Declaration of CustomEmail::subject(string $bar) must be compatible with Email::subject(Stringable|string $bar) in /in/uuJj9 on line 11
Process exited with code 255.
preferences:
182.01 ms | 1008 KiB | 7 Q