PHP MAP
class Mapob implements IteratorAggregate,ArrayAccess,Countable{
private $data = array();
public function add($key,$value)
{
$this->data[$key] = $value;
}
public function remove($key)
{
if(isset($this->data[$key]))
{
$value = $this->data[$key];
unset($this->data[$key]);
return $value;
}
return null;
}
public function clean()
{
foreach($this->getKeys() as $key)
{
$this->remove($key);
}
}
public function getKeys()
{
return array_keys($this->data);
}
public function itemAt($key)
{
if(isset($this->data[$key]))
return $this->data[$key];
else
return null;
}
public function copyData($data)
{
if(is_array($data))
{
foreach($data as $key=>$value)
{
$this->add($key,$value);
}
}
}
public static function dataMerge($dataOne,$dataTwo)
{
foreach($dataTwo as $key=>$value)
{
if(is_integer($key))
$dataOne[] = $value;
elseif(isset($dataOne[$key]) && is_array($dataOne[$key]) && is_array($value))
$dataOne[$key] = self::dataMerge($dataOne[$key],$value);
else
$dataOne[$key] = $value;
}
}
public function getCount()
{
return count($this->data);
}
public function toArray()
{
return $this->data;
}
/*实现spl接口*/
public function getIterator()
{
return new MapobIterator($this->data);
}
public function count()
{
return $this->getCount();
}
public function offsetExists($offset)
{
return $this->data[$offset]!==null;
}
public function offsetGet($offset)
{
return $this->itemAt($offset);
}
public function offsetSet($offset,$item)
{
$this->add($offset,$item);
}
public function offsetUnset($offset)
{
$this->remove($offset);
}
}
class MapobIterator implements Iterator
{
private $data = array();
private $keys = array();
public function __construct(&$data)
{
$this->data = &$data;
$this->keys = array_keys($data);
}
public function rewind()
{
$this->key = reset($this->keys);
}
public function key()
{
return $this->key;
}
public function current()
{
return $this->data[$this->key];
}
public function next()
{
$this->key = next($this->keys);
}
public function valid()
{
return $this->key!==false;
}
}
$a = new Mapob();
$a->add('a','b');
$a->add('b','c');
$a->add('c','d');
$a->add('d','e');
foreach($a as $key=>$value)
{
echo $key;
echo $value;
echo "<br>";
}
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