3v4l.org

run code in 300+ PHP versions simultaneously
<?php abstract class Foo{ abstract function xxx(stdClass $a); } trait BarTrick{ abstract function xxx($a): stdClass; } abstract class Bar extends Foo{ use BarTrick; } class Baz extends Bar{ function xxx($a): stdClass{} }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
Fatal error: Declaration of Foo::xxx(stdClass $a) must be compatible with BarTrick::xxx($a): stdClass in /in/iX31H on line 4
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33
Fatal error: Declaration of BarTrick::xxx($a): stdClass must be compatible with Foo::xxx(stdClass $a) in /in/iX31H on line 11
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/iX31H on line 8
Process exited with code 255.
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