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                                 array_reduce

   (PHP 4 >= 4.0.5)
   array_reduce --  Iteratively reduce the array to a single value using
   a callback function

Description

   mixed array_reduce ( array input, callback function [, int initial])

   array_reduce() applies iteratively the function function to the
   elements of the array input, so as to reduce the array to a single
   value. If the optional initial is available, it will be used at the
   beginning of the process, or as a final result in case the array is
   empty.

   Example 1. array_reduce() example
   <?php
   function rsum($v, $w) {
       $v += $w;
       return $v;
   }
   function rmul($v, $w) {
       $v *= $w;
       return $v;
   }
   $a = array(1, 2, 3, 4, 5);
   $x = array();
   $b = array_reduce($a, "rsum");
   $c = array_reduce($a, "rmul", 10);
   $d = array_reduce($x, "rsum", 1);
   ?>

   This will result in $b containing 15, $c containing 1200 (=
   1*2*3*4*5*10), and $d containing 1.

   See also array_filter(), array_map(), array_unique(), and
   array_count_values().
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