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run code in 300+ PHP versions simultaneously
<?php var_dump(json_encode(array('test' => kürze)));
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Fatal error: Uncaught Error: Undefined constant "kürze" in /in/I1tE3:3 Stack trace: #0 {main} thrown in /in/I1tE3 on line 3
Process exited with code 255.
Output for 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant kürze - assumed 'kürze' (this will throw an Error in a future version of PHP) in /in/I1tE3 on line 3 string(21) "{"test":"k\u00fcrze"}"
Output for 5.6.38, 7.1.0 - 7.1.22
Notice: Use of undefined constant kürze - assumed 'kürze' in /in/I1tE3 on line 3 string(21) "{"test":"k\u00fcrze"}"

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