3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A {} class B extends A {} class Foo { public function bar() : A {} } class Woo extends Foo { public function bar() : B {} } $w = new Woo();
Output for 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33
Fatal error: Declaration of Woo::bar(): B must be compatible with Foo::bar(): A in /in/i79O5 on line 13
Process exited with code 255.
Output for 5.6.0 - 5.6.40
Parse error: syntax error, unexpected ':', expecting ';' or '{' in /in/i79O5 on line 8
Process exited with code 255.
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217.32 ms | 401 KiB | 301 Q