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run code in 150+ php & hhvm versions
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<?ph p $a + $b;
Output for 5.3.29, 5.4.29 - 5.4.32
<?ph p $a + $b;
Output for 5.3.0 - 5.3.28, 5.4.0 - 5.4.28
<?ph p $a + $b;