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  array_reduce

array_reduce

(PHP 4 >= 4.0.5, PHP 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. If the array is empty and initial is not passed, array_reduce() returns NULL.

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 (= 10*1*2*3*4*5), and $d containing 1.

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

 
 


 
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