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run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(headers_sent()); // false var_dump(headers_sent()); //true
based on BS6sh
Output for 5.2.3 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
bool(false) bool(true)
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 5.0.5, 5.1.1 - 5.2.2
bool(true) bool(true)
Output for 5.1.0
Fatal error: fatal flex scanner internal error--end of buffer missed in /in/95sC7 on line 3
Process exited with code 255.