3v4l.org

run code in 500+ PHP versions simultaneously
<?php trait T1 { abstract public function test($x); } trait T2 { abstract public function test($x): int; } class C { use T1, T2; public function test($x): int {} }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
Output for 7.4.0 - 7.4.33
Fatal error: Declaration of T1::test($x) must be compatible with T2::test($x): int in /in/8Ze2C on line 4
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33
Fatal error: Declaration of T1::test($x) must be compatible with T2::test($x): int in /in/8Ze2C on line 11
Process exited with code 255.
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117.87 ms | 1499 KiB | 4 Q