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

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