說明
1、實現其他迭代器功能的接口，相當于在其他迭代器上安裝一個外殼，只有一種方法。
2、聚合迭代器可以與許多迭代器結合，實現更高效的迭代。
實例
class MainIterator implements Iterator
{
private $var = array();
public function __construct($array) //構造函數, 初始化對象數組
{
if (is_array($array)) {
$this->var = $array;
}
}
public function rewind() {
echo "rewinding\n";
reset($this->var); //將數組的內部指針指向第一個單元
}
public function current() {
$var = current($this->var); // 返回數組中的當前值
echo "current: $var\n";
return $var;
}
public function key() {
$var = key($this->var); //返回數組中內部指針指向的當前單元的鍵名
echo "key: $var\n";
return $var;
}
public function next() {
$var = next($this->var); //返回數組內部指針指向的下一個單元的值
echo "next: $var\n";
return $var;
}
public function valid() {
return !is_null(key($this->var); //判斷當前單元的鍵是否為空
}
}
內容擴展:
?php
class myData implements IteratorAggregate {
public $property1 = "Public property one";
public $property2 = "Public property two";
public $property3 = "Public property three";
public function __construct() {
$this->property4 = "last property";
}
public function getIterator() {
return new ArrayIterator($this);
}
}
$obj = new myData;
foreach($obj as $key => $value) {
var_dump($key, $value);
echo "\n";
}
?>
以上例程的輸出類似于：
string(9) "property1"
string(19) "Public property one"
string(9) "property2"
string(19) "Public property two"
string(9) "property3"
string(21) "Public property three"
string(9) "property4"
string(13) "last property"
到此這篇關于php聚合式迭代器的基礎知識點及實例代碼的文章就介紹到這了,更多相關php聚合式迭代器是什么內容請搜索腳本之家以前的文章或繼續瀏覽下面的相關文章希望大家以后多多支持腳本之家！
您可能感興趣的文章:- PHP聚合式迭代器接口IteratorAggregate用法分析
