silverstripe-fulltextsearch/code/utils/MultipleArrayIterator.php

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<?php
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namespace SilverStripe\FullTextSearch\Utils;
use Iterator;
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class MultipleArrayIterator implements Iterator
{
protected $arrays;
protected $active;
public function __construct()
{
$args = func_get_args();
$this->arrays = array();
foreach ($args as $arg) {
if (is_array($arg) && count($arg)) {
$this->arrays[] = $arg;
}
}
$this->rewind();
}
public function rewind()
{
$this->active = $this->arrays;
if ($this->active) {
reset($this->active[0]);
}
}
public function current()
{
return $this->active ? current($this->active[0]) : false;
}
public function key()
{
return $this->active ? key($this->active[0]) : false;
}
public function next()
{
if (!$this->active) {
return;
}
if (next($this->active[0]) === false) {
array_shift($this->active);
if ($this->active) {
reset($this->active[0]);
}
}
}
public function valid()
{
return $this->active && (current($this->active[0]) !== false);
}
}