<?php
$obj = new SplDoublyLinkedList();
$obj->push(1);
$obj->push(2);
$obj->push(3);
$obj->unshift(10);   //unshifit 替換雙向鏈表的首部
$obj->rewind();     //  使用current 必須調用rewind,把節點指針指向bottom節點
 $obj->next();    //    next 指向下一個節點
$obj->prev();   // 指針指向上一個節點
echo $obj->current();   //  指針指向當前結點
if($obj->current())
{
    echo "y";
}else{
    echo "n";
}

    if($obj->valid()){
        //如果當前節點是有效節點 valid則返回true
    }
$obj->pop();  
    //var_dump($obj);
print_r($obj);

<?php
$stack = new SplStack();  //實例化堆棧
$stack->push("a");        //向堆棧中加入數據
$stack->push("b");
$stack->push("c");
/*
$stack->offsetSet(0,'C');  //堆棧的節點0是top 的節點，設置節點的值
$stack->rewind(); //雙向鏈表的rewind和堆棧的rewind相反，堆棧的rewind使得當前指針指向TOP所在的位置，而雙向鏈表調用之后指向bottom所在的位置


echo "qq".$stack->next();  // 堆棧的next與雙向鏈表相反
echo "re".$stack->current()."</br>";
//echo "bo".$stack->bottom()."</br>";
//echo "top".$stack->top();

print_r($stack);
*/
//從TOP開始遍歷
$stack->rewind();
while($stack->valid()){
    echo $stack->key()."=>".$stack->current()."</br>";
    $stack->next();
}
$pop = $stack->pop();
echo $pop;
//pop操作從堆棧里面提取出的最后一個元素（TOP位置），同時在堆棧刪除該節點

$que = new SplQueue();
$que->enqueue("a");    //    入隊列
$que->enqueue("b");
$que->enqueue("c");

//print_r($que);
echo "bottom".$que->bottom()."</br>";
echo "top".$que->top();
$que->rewind();  
$que->dequeue();    //出隊列
//從 bottom 位置刪除
print_r($que);

<?php
$fruits = array(
    "apple"  => "apple value",
    "orange" => "orange value",
    "grape" => "grape value"
);                //定義一個水果數組

$obj = new ArrayObject($fruits);
$it = $obj->getIterator();
    //  用foreach 實現遍歷數組
foreach($it as $key => $value){

    echo $key."->".$value."</br>";
}

$it->rewind();  //必須要 rewind
//用 while 來遍歷數組
while($it->valid()){

    echo $it->key()."->".$it->current()."</br>";
     $it->next();
}
//跳過某些元素進行打印
$it->rewind();
if($it->valid()){

    $it->seek(1); //尋找到1的元素
    while($it->valid()){

        echo $it->key()."->".$it->current()."</br>";
        $it->next();
    }

}
echo "</br>";
$it->rewind();
//$it->ksort();  //進行排序  用key ,
//$it->rewind();
$it->asort(); //按value 進行排序
while($it->valid()){

    echo $it->key()."->".$it->current()."</br>";
    $it->next();
}

<?php
$array_a = new ArrayIterator(array('a','b','c'));  //定義兩個 ArrayIterator
$array_b = new ArrayIterator(array('d','e','f'));
$it = new AppendIterator();
$it->append($array_a);        //  將ArrayIterator追加到Iterator里
$it->append($array_b);
foreach($it as $key => $value){

    echo $key."||".$value."</br>";
}
//通過APPEND方法把迭代器對象添加到AppendIterator對象中
//把兩個數組的 數值添加到一個Interator

$idIter = new ArrayIterator(array('01','02','03'));
$nameIter =  new ArrayIterator(array('qq','ss','show'));

$mit = new MultipleIterator(MultipleIterator::MIT_KEYS_ASSOC);
$mit->attachIterator($idIter,"id");
$mit->attachIterator($nameIter,"name");

foreach($mit as $value){

    print_r($value);

}

date_default_timezone_get('PRC');
$it = new FilesystemIterator('.');
foreach($it as $value){
    echo date("Y-m-d H:i:s",$value->getMtime())."</br>";
    $value->isDir()?"<dir>":"";
    number_format($value->getSize());
    echo $value->getFileName();
}

$array=array('value1','value2','value3','value4','value5');
$out = new Outer(new ArrayIterator($array));
foreach($out as $key => $value){
    echo $key."||".$value."</br>";
}

    class Outer extends IteratorIterator{
        public function current(){
            return parent::current()."why";
        }
        public function key(){
            return parent::current()."not";
        }
    }
//可以定制key和value 的值

class Count implements Countable{

    protected  $mycount = 4;
    public function count(){
        return $this->mycount;
    }
}

$count  = new Count();
echo count($count);

spl_autoload_extensions('.class.php,.php'); //設定以什么擴展名結尾
set_include_path(get_include_path().PATH_SEPARATOR."autoload/"); //設定文件的目錄
spl_autoload_register();
new test();
///spl_autoload_register('')可以自定義

//比如我有一個文件在 文件夾 autoload下
class test{
    public function __construct(){
        echo " this is test.class.php";
    }
}

date_default_timezone_set('PRC');
$file = new SplFileInfo('qq.txt');
echo "file is create at".date("Y-m-d H:i:s",$file->getCTime())."</br>";
echo "file is modified at".date("Y-m-d H:i:s",$file->getMTime())."</br>";
echo "file size".$file->getSize()."kb</br>";


$fileObj = $file->openFile("r");
while($fileObj->valid()){
    echo $fileObj->fgets();
}
$fileObj = null;
$file = null;