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run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = true; $x += 4; var_dump($x); // 5
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(5)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/CRFN6 on line 4
Process exited with code 255.