3v4l.org

run code in 300+ PHP versions simultaneously
<?php abstract class A { abstract function bar(stdClass $x); } abstract class B extends A { } class C extends B { function bar($x): stdClass{} }
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Fatal error: Declaration of C::bar($x): stdClass must be compatible with A::bar(stdClass $x) in /in/Q0hlP on line 5
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/Q0hlP on line 5
Process exited with code 255.
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84.31 ms | 1935 KiB | 4 Q