Description
mixed
array_reduce ( array input, mixed callback [, int initial])
array_reduce() applies iteratively the
callback 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 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() and
array_map().
