3v4l.org

run code in 300+ PHP versions simultaneously
<?php is_a("kkk", string);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
Fatal error: Uncaught Error: Undefined constant "string" in /in/v55mk:3 Stack trace: #0 {main} thrown in /in/v55mk on line 3
Process exited with code 255.
Output for 7.2.6 - 7.2.33, 7.3.12 - 7.3.33, 7.4.0 - 7.4.33
Warning: Use of undefined constant string - assumed 'string' (this will throw an Error in a future version of PHP) in /in/v55mk on line 3
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20
Notice: Use of undefined constant string - assumed 'string' in /in/v55mk on line 3
Output for 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Notice: Use of undefined constant string - assumed 'string' in /in/v55mk on line 3 Strict Standards: is_a(): Deprecated. Please use the instanceof operator in /in/v55mk on line 3

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234.88 ms | 405 KiB | 355 Q