silverstripe-fulltextsearch/code/utils/CombinationsArrayIterator.php

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