(PHP 4 >= 4.0.5)
array_reduce -- Iteratively reduce the array to a single value using a callback
function
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.
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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);
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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().
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