function array_sum (array) {

// http://kevin.vanzonneveld.net

// + original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)

// + bugfixed by: Nate

// + bugfixed by: Gilbert

// + improved by: David Pilia (http://www.beteck.it/)

// + improved by: Brett Zamir (http://brett-zamir.me)

// * example 1: array_sum([4, 9, 182.6]);

// * returns 1: 195.6

// * example 2: total = []; index = 0.1; for (y=0; y < 12; y++){total[y] = y + index;}

// * example 2: array_sum(total);

// * returns 2: 67.2

var key, sum = 0;

if (array && typeof array === 'object' && array.change_key_case) { // Duck-type check for our own array()-created PHPJS_Array

return array.sum.apply(array, Array.prototype.slice.call(arguments, 0));

}

// input sanitation

if (typeof array !== 'object') {

return null;

}

for (key in array) {

if (!isNaN(parseFloat(array[key]))) {

sum += parseFloat(array[key]);

}

}

return sum;

}