PHP array_sum function

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array_sum

(PHP 4 >= 4.0.4, PHP 5)

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

Example 1. array_sum() examples

$a = array(2, 4, 6, 8);
echo "sum(a) = " . array_sum($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:

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).