3v4l.org

run code in 300+ PHP versions simultaneously
<?php trait T { abstract public function test(int $x); } class P { public function test(string $x) {} } class C extends P { use T; }
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1 - 8.4.2
Fatal error: Declaration of P::test(string $x) must be compatible with T::test(int $x) in /in/4VCIp on line 8
Process exited with code 255.
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Fatal error: Declaration of P::test(string $x) must be compatible with T::test(int $x) in /in/4VCIp on line 11
Process exited with code 255.
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80.29 ms | 407 KiB | 5 Q