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 PHP manuál : function.array-sum.html

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

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).

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