Arrays
PHP Manual

array_sum

(PHP 4 >= 4.0.4, PHP 5)

array_sum — Calculate the sum of values in an array

Description

number array_sum ( array $array )

array_sum() returns the sum of values in an array as an integer or float.

Example#1 array_sum() examples

<?php
$a 
= array(2468);
echo 
"sum(a) = " array_sum($a) . "\n";

$b = array("a" => 1.2"b" => 2.3"c" => 3.4);
echo 
"sum(b) = " array_sum($b) . "\n";
?>

The above example will output:

sum(a) = 20 sum(b) = 6.9

Note: PHP versions prior to 4.2.1 modified the passed array itself and converted strings to numbers (which most of the time converted them to zero, depending on their value).


Arrays
PHP Manual