如何用php递归函进行数字累加操作？php递归函数累加求和

<?php
function summation ($count) {
   if ($count != 0) :
     return $count + summation($count-1);
   endif;
}
$sum = summation(10);
print "Summation = $sum";
?>

<?php
/**
desc：数组递归求和
link：www.jb200.com
date：2013/2/22
*/
function arraySumRecursive($array)
{
  $total = 0;
  foreach(new recursiveIteratorIterator( new recursiveArrayIterator($array)) as $num)
 {
    $total += $num;
 }
    return $total;
}

/*** a flat array ***/
$array = array(10, 20, 5, 34, 129);

/*** add the values ***/
echo arraySumRecursive($array)."<br />";

/*** a multi dimensional array ***/
$array = array(10, 20, 5,
    array(5, 2, 3,
        array(5, 3,
          array(2, 10,
              array(19, 1)
             ),3
       ), 2, 7
     ), 3
);

/*** add the values ***/
echo arraySumRecursive($array);
?>