Iteratively reduce the array to a single value using a callback function array_rand array_reverse Array Functions PHP Manual 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 $initial ] ) array_reduce() applies iteratively the function function to the elements of the array input , so as to reduce the array to a single value. Parameters input The input array. function The callback function. initial If the optional initial is available, it will be used at the beginning of the process, or as a final result in case the array is empty. Return Values Returns the resulting value. If the array is empty and initial is not passed, array_reduce() returns NULL. Examples Example #1 array_reduce() example <?phpfunction rsum($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() array_count_values() array_rand array_reverse Array Functions PHP Manual
