php man page for array_sum

ARRAY_SUM(3)								 1							      ARRAY_SUM(3)

array_sum - Calculate the sum of values in an array

SYNOPSIS
       number array_sum (array	$array)

DESCRIPTION
       array_sum(3) returns the sum of values in an array.

PARAMETERS
	      o $array
		- The input array.

RETURN VALUES
	Returns the sum of values as an integer or float.

EXAMPLES
       Example #1

	      array_sum(3) examples

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

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

	      The above example will output:

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

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