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array_reduce
Iteratively reduce the array to a single value using a callback function
(PHP 4 >= 4.0.5, PHP 5)
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.
If the array is empty and initial is not passed,
array_reduce() returns NULL.
Example 273. 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 (= 10*1*2*3*4*5), and
$d containing 1.
See also array_filter(), array_map(), array_unique(), and array_count_values().