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run code in 150+ php & hhvm versions
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<?php function aabbcc($a){ if($a>0){ return $a+aabbcc($a-1); }else{ return $a; } } aabbcc(10); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0