Summing and Recursion

david8787

If I have a multidimensional associative array is it possible to use recursion to sum all the values? I can't figure out how to do this? Any ideas?

e.g.

$myArray = array (0=>19,
1=>32,
2=>array(0=>12,
1=>15
)
3=>9,
4=>array(0=>2,
1=>5
)
)

halojoy

This is the shortest function
I could come up with.

function will test if element is_array
and add result of a recursive call if it is
otherwise it will just add value, $val

<?php

function sum_array($arr){
	$res = 0;
	foreach($arr AS $val)
		$res += is_array($val)? sum_array($val) : $val;
	return $res;
}

$myArray = array (0=>19,
1=>32,
2=>array(0=>12,1=>15),
3=>9,
4=>array(0=>2,1=>5)
);

echo sum_array($myArray); // will display 94

?>

david8787

I didn't realize there was such a function 'is_array'. I was trying all sorts of weird stuff to mimic that. Thanks.

johanafm

I prefer letting php to the work for me

function addVal($v = 0, $k = 0) {
	static $sum = 0;
	if (is_int($v))
		$sum += $v;
	return $sum;
}
array_walk_recursive($myArray, 'addVal');
echo addVal();