<?php function rev($str) { if ( ! $str ) { return; } return rev(substr($str,1)) . $str{0}; } function sum($arr) { if ( empty($arr) ) { return 0; } return $arr[0] + sum(array_shift($arr)); } $a = array(5,4,7,8,9,3); echo sum($a); echo rev('hola mundos ninos');
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