3v4l.org

run code in 300+ PHP versions simultaneously
<?php class A {public ?string $r = '';} class B extends A {public ?string $r;} (new B)->r;
Output for 7.4.0 - 7.4.32, 8.0.1 - 8.0.24, 8.1.0 - 8.1.11
Fatal error: Uncaught Error: Typed property B::$r must not be accessed before initialization in /in/VWZrF:6 Stack trace: #0 {main} thrown in /in/VWZrF on line 6
Process exited with code 255.

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