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run code in 150+ php & hhvm versions
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<?php $heading_level = 'dsfhsdjfhdjshfjsdhfjdshfjshdfjhds 3242343242'; $heading_level++; $heading_level++; echo $heading_level;
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
dsfhsdjfhdjshfjsdhfjdshfjshdfjhds 3242343244
Output for hhvm-3.10.0

Process exited with code 153.