IteratorAggregate::getIterator
To take full advantages of all array features with ArrayAccess, then you would need to implements Countable and Iterator
Like this.
<?php
class ArrayOfColorModel implements ArrayAccess, Iterator, Countable {
private $container = array();
public function __construct() {
}
public function offsetSet($offset,$value) {
if ($value instanceof ColorModel){
if ($offset == "") {
$this->container[] = $value;
}else {
$this->container[$offset] = $value;
}
} else {
throw new Exception("Value have to be a instance of the Model ColorModel");
}
}
public function offsetExists($offset) {
return isset($this->container[$offset]);
}
public function offsetUnset($offset) {
unset($this->container[$offset]);
}
public function offsetGet($offset) {
return isset($this->container[$offset]) ? $this->container[$offset] : null;
}
public function rewind() {
reset($this->container);
}
public function current() {
return current($this->container);
}
public function key() {
return key($this->container);
}
public function next() {
return next($this->container);
}
public function valid() {
return $this->current() !== false;
}
public function count() {
return count($this->container);
}
}
?>
Now you can using it like any other array.
<?php
$array = new ArrayOfColorModel();
foreach ($array as $model) {
var_export($model);
}
// OR
for($i=0;$i<count($array);$i++){
var_export($array[$i]);
}
?>
ArrayAccess インターフェイス
導入
配列としてオブジェクトにアクセスするための機能のインターフェイスです。
インターフェイス概要
ArrayAccess
ArrayAccess
{
/* Methods */
}例1 基本的な使用法
<?php
class obj implements arrayaccess {
private $container = array();
public function __construct() {
$this->container = array(
"one" => 1,
"two" => 2,
"three" => 3,
);
}
public function offsetSet($offset, $value) {
$this->container[$offset] = $value;
}
public function offsetExists($offset) {
return isset($this->container[$offset]);
}
public function offsetUnset($offset) {
unset($this->container[$offset]);
}
public function offsetGet($offset) {
return isset($this->container[$offset]) ? $this->container[$offset] : null;
}
}
$obj = new obj;
var_dump(isset($obj["two"]));
var_dump($obj["two"]);
unset($obj["two"]);
var_dump(isset($obj["two"]));
$obj["two"] = "A value";
var_dump($obj["two"]);
?>
上の例の出力は、 たとえば以下のようになります。
bool(true) int(2) bool(false) string(7) "A value"
目次
- ArrayAccess::offsetExists — オフセットが存在するかどうか
- ArrayAccess::offsetGet — オフセットを取得する
- ArrayAccess::offsetSet — オフセットを設定する
- ArrayAccess::offsetUnset — オフセットの設定を解除する
add a note
User Contributed NotesArrayAccess
Cintix
29-Oct-2009 10:32
29-Oct-2009 10:32
AryehGregor+php-comment at gmail dot com
09-Jan-2009 02:33
09-Jan-2009 02:33
Note that at least in PHP 5.1, objects implementing ArrayAccess cannot return objects by reference. See http://bugs.php.net/bug.php?id=34783 . If you have code like
<?php
$x = &$y[0];
?>
then this will (as far as I can tell) *always* fail unless $y is a real array -- it cannot work if $y is an object implementing ArrayAccess. If your offsetGet() function returns by reference, you get the fatal error "Declaration of MyClass::offsetGet() must be compatible with that of ArrayAccess::offsetGet()". If you try to have it return by value, however, you get the (contradictory) fatal error "Objects used as arrays in post/pre increment/decrement must return values by reference", at least in my version of PHP.
It is therefore not possible to take arbitrary code dealing with arrays and try to substitute an object of your own for an array, even if all of the normal array functions didn't fail as well (which they do, or at least some of them).