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run code in 300+ PHP versions simultaneously
<?php $f = function($i){ if($i<5){ echo $i; $this->call(++$i); } }; $f(1);
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.6 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
1 Fatal error: Uncaught Error: Using $this when not in object context in /in/iuP1p:6 Stack trace: #0 /in/iuP1p(10): {closure}(1) #1 {main} thrown in /in/iuP1p on line 6
Process exited with code 255.
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
1 Fatal error: Using $this when not in object context in /in/iuP1p on line 6
Process exited with code 255.

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