php - array_reduce

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. If the array is empty and initial is not passed, array_reduce() returns NULL.

Example 268. 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);
?>

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