silverstripe-fulltextsearch/code/utils/CombinationsArrayIterator.php

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<?php
class CombinationsArrayIterator implements Iterator {
protected $arrays;
protected $keys;
protected $numArrays;
protected $isValid = false;
protected $k = 0;
function __construct($args) {
$this->arrays = array();
$this->keys = array();
$keys = array_keys($args);
$values = array_values($args);
foreach ($values as $i => $arg) {
if (is_array($arg) && count($arg)) {
$this->arrays[] = $arg;
$this->keys[] = $keys[$i];
}
}
$this->numArrays = count($this->arrays);
$this->rewind();
}
function rewind() {
if (!$this->numArrays) {
$this->isValid = false;
}
else {
$this->isValid = true;
$this->k = 0;
for ($i = 0; $i < $this->numArrays; $i++) reset($this->arrays[$i]);
}
}
function valid() {
return $this->isValid;
}
function next() {
$this->k++;
for ($i = 0; $i < $this->numArrays; $i++) {
if (next($this->arrays[$i]) === false) {
if ($i == $this->numArrays-1) $this->isValid = false;
else reset($this->arrays[$i]);
}
else break;
}
}
function current() {
$res = array();
for ($i = 0; $i < $this->numArrays; $i++) $res[$this->keys[$i]] = current($this->arrays[$i]);
return $res;
}
function key() {
return $this->k;
}
}