for testing and deploying your application
for finding and fixing issues
for empowering human code reviews
<?php
namespace SilverStripe\Core\Config;
use Iterator;
class DAG_Iterator implements Iterator
{
protected $data;
protected $dag;
protected $dagkeys;
protected $i;
public function __construct($data, $dag)
$this->data = $data;
$this->dag = $dag;
$this->rewind();
}
public function key()
return $this->i;
public function current()
$res = array();
$res['from'] = $this->data[$this->i];
$res['to'] = array();
foreach ($this->dag[$this->i] as $to) {
$res['to'][] = $this->data[$to];
return $res;
public function next()
$this->i = array_shift($this->dagkeys);
public function rewind()
$this->dagkeys = array_keys($this->dag);
$this->next();
public function valid()
return $this->i !== null;
silverstripe /
silverstripe-framework
