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run code in 300+ PHP versions simultaneously
<?php $book="ABC"; $name="book"; $php="name"; $language="php"; print($book); print(\n); print($$name); print(\n); print($$$php); print($$$$language);
Output for git.master, git.master_jit, rfc.property-hooks
ABC Fatal error: Uncaught Error: Undefined constant "n" in /in/SkLYF:7 Stack trace: #0 {main} thrown in /in/SkLYF on line 7
Process exited with code 255.

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