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run code in 150+ php & hhvm versions
Bugs & Features
<?php function sum($arr) { if ( empty($arr) ) { return; } return $arr[0] + sum(array_slice($arr, 1)); } function rev($str) { if ( ! $str ) { return; } return rev(substr($str,1)) . $str{0}; } echo sum(array(1,2,3,4,5)); echo rev('hola mundo');
Output for 5.3.7 - 7.1.0
15odnum aloh