3v4l.org

run code in 200+ PHP versions simultaneously
<?php trait T { abstract public function test(int $x); } abstract class P { use T; } class C extends P { public function test(string $x) {} }
based on 4VCIp
Output for 7.4.0 - 7.4.1
Fatal error: Declaration of C::test(string $x) must be compatible with P::test(int $x) in /in/q7Bq2 on line 12
Process exited with code 255.
Output for 7.2.0 - 7.3.13
Fatal error: Declaration of C::test(string $x) must be compatible with P::test(int $x) in /in/q7Bq2 on line 11
Process exited with code 255.