PHP 標準ライブラリ (SPL) の注意事項

- 数据结构    解决数据怎么存储问题- 元素遍历    数据怎么查看- 常用方法的统一调用    数组、集合大小    自定义遍历- 类自动加载    spl_autoload_register

interface Iterator extends Traversable{    //返回当前元素    public mixed current ( void );        //返回当前元素的键    public scalar key ( void );        //向前移动到下一个元素    public void next ( void );        //返回到迭代器的第一个元素    public void rewind ( void );        //检查当前位置是否有效    public boolean valid ( void );}

interface ArrayAccess {    //检查一个偏移位置是否存在     public mixed offsetExists ( mixed $offset  );        //获取一个偏移位置的值     public mixed offsetGet( mixed $offset  );        //设置一个偏移位置的值     public mixed offsetSet ( mixed $offset  );        //复位一个偏移位置的值     public mixed offsetUnset  ( mixed $offset  );}

IteratorAggregate extends Traversable {    /* 获取一个外部迭代器 */    abstract public Traversable getIterator ( void )}

<?phpclass 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";}?>

SplDoublyLinkedList implements Iterator , ArrayAccess , Countable {/* 方法 */public __construct ( void )public void add ( mixed $index , mixed $newval )public mixed bottom ( void )public int count ( void )public mixed current ( void )public int getIteratorMode ( void )public bool isEmpty ( void )public mixed key ( void )public void next ( void )public bool offsetExists ( mixed $index )public mixed offsetGet ( mixed $index )public void offsetSet ( mixed $index , mixed $newval )public void offsetUnset ( mixed $index )public mixed pop ( void )public void prev ( void )public void push ( mixed $value )public void rewind ( void )public string serialize ( void )public void setIteratorMode ( int $mode )public mixed shift ( void )public mixed top ( void )public void unserialize ( string $serialized )public void unshift ( mixed $value )public bool valid ( void )}

SplDoublyLinkedList::IT_MODE_LIFO (Stack style)SplDoublyLinkedList::IT_MODE_FIFO (Queue style)

SplDoublyLinkedList::IT_MODE_DELETE (Elements are deleted by the iterator)SplDoublyLinkedList::IT_MODE_KEEP (Elements are traversed by the iterator)

<?php/***SplDoublyLinkedList 类学习*/$obj = new SplDoublyLinkedList();$obj -> push(1);//把新的节点添加到链表的顶部top$obj -> push(2);$obj -> push(3);$obj -> unshift(10);//把新节点添加到链表底部bottomprint_r($obj);$obj ->rewind();//rewind操作用于把节点指针指向Bottom所在节点$obj -> prev();//使指针指向上一个节点，靠近Bottom方向echo 'next node :'.$obj->current().PHP_EOL;$obj -> next();$obj -> next();echo 'next node :'.$obj->current().PHP_EOL;$obj -> next();if($obj -> current())        echo 'current node valid'.PHP_EOL;else        echo 'current node invalid'.PHP_EOL;$obj ->rewind();//如果当前节点是有效节点，valid返回trueif($obj->valid())        echo 'valid list'.PHP_EOL;else        echo 'invalid list'.PHP_EOL;print_r($obj);echo 'pop value :'.$obj -> pop().PHP_EOL;print_r($obj);echo 'next node :'.$obj ->current().PHP_EOL;$obj ->next();//1$obj ->next();//2$obj -> pop();//把top位置的节点从链表中删除，并返回，如果current正好指>向top位置，那么调用pop之后current()会失效echo 'next node:'.$obj -> current().PHP_EOL;print_r($obj);$obj ->shift();//把bottom位置的节点从链表中删除，并返回print_r($obj);

bottom:1 top:3 top:10current:10current:22=>10 1=>2 0=>1 10--2--1--

/* 方法 */__construct ( void )mixed dequeue ( void )void enqueue ( mixed $value )void setIteratorMode ( int $mode )

<?php$queue = new SplQueue();$queue->enqueue(1);$queue->enqueue(2);echo $queue->dequeue() .'--';echo $queue->dequeue() .'--';//1--2--

<?php$obj = new SplQueue();$obj -> enqueue('a');$obj -> enqueue('b');$obj -> enqueue('c');echo 'bottom:'.$obj -> bottom().PHP_EOL;echo 'top:'.$obj -> top();echo '<br/>';//队列里的offset=0是指向bottom位置$obj -> offsetSet(0,'A');echo 'bottom:'.$obj -> bottom();echo '<br/>';//队列里的rewind使得指针指向bottom所在位置的节点$obj -> rewind();echo 'current:'.$obj->current();echo '<br/>';while ($obj ->valid()) {    echo $obj ->key().'=>'.$obj->current().PHP_EOL;    $obj->next();//}echo '<br/>';//dequeue操作从队列中提取bottom位置的节点，并返回，同时从队列里面删除该元素echo 'dequeue obj:'.$obj->dequeue();echo '<br/>';echo 'bottom:'.$obj -> bottom().PHP_EOL;

bottom:a top:cbottom:Acurrent:A0=>A 1=>b 2=>c dequeue obj:Abottom:b

abstract SplHeap implements Iterator , Countable {    /* 方法 */    public __construct ( void )    abstract protected int compare ( mixed $value1 , mixed $value2 )    public int count ( void )    public mixed current ( void )    public mixed extract ( void )    public void insert ( mixed $value )    public bool isEmpty ( void )    public mixed key ( void )    public void next ( void )    public void recoverFromCorruption ( void )    public void rewind ( void )    public mixed top ( void )    public bool valid ( void )}

<?phpclass MySimpleHeap extends SplHeap{    //compare()方法用来比较两个元素的大小，绝对他们在堆中的位置    public function  compare( $value1, $value2 ) {        return ( $value1 - $value2 );    }} $obj = new MySimpleHeap();$obj->insert( 4 );$obj->insert( 8 );$obj->insert( 1 );$obj->insert( 0 ); echo $obj->top();  //8echo $obj->count(); //4echo '<br/>'; foreach( $obj as $number ) {    echo $number.PHP_EOL;}

848 4 1 0

<?php$obj = new SplMinHeap();$obj->insert(4);$obj->insert(8);//提取echo $obj->extract(). PHP_EOL;echo $obj->extract();//4 8

$pq = new SplPriorityQueue(); $pq->insert('a', 10);$pq->insert('b', 1);$pq->insert('c', 8); echo $pq->count() .PHP_EOL; //3echo $pq->current() . PHP_EOL; //a /** * 设置元素出队模式 * SplPriorityQueue::EXTR_DATA 仅提取值 * SplPriorityQueue::EXTR_PRIORITY 仅提取优先级 * SplPriorityQueue::EXTR_BOTH 提取数组包含值和优先级 */$pq->setExtractFlags(SplPriorityQueue::EXTR_DATA); while($pq->valid()) {    print_r($pq->current());  //a c b    $pq->next();}

<?php$arr = new SplFixedArray(5);$arr[0] = 1;$arr[1] = 2;$arr[2] = 3;print_r($arr);//SplFixedArray Object ( [0] => 1 [1] => 2 [2] => 3 [3] => [4] => )

class A {    public $i;    public function __construct($i) {        $this->i = $i;    }} $a1 = new A(1);$a2 = new A(2);$a3 = new A(3);$a4 = new A(4); $container = new SplObjectStorage(); //SplObjectStorage::attach 添加对象到Storage中$container->attach($a1);$container->attach($a2);$container->attach($a3); //SplObjectStorage::detach 将对象从Storage中移除$container->detach($a2); //SplObjectStorage::contains用于检查对象是否存在Storage中var_dump($container->contains($a1)); //truevar_dump($container->contains($a4)); //false //遍历$container->rewind();while($container->valid()) {    var_dump($container->current());    $container->next();}

<?php// a simple foreach() to traverse the SPL class namesforeach(spl_classes() as $key=>$value)        {        echo $key.' -&gt; '.$value.'<br />';        }?>

$file = new SplFileInfo('foo-bar.txt'); print_r(array(    'getATime' => $file->getATime(), //最后访问时间    'getBasename' => $file->getBasename(), //获取无路径的basename    'getCTime' => $file->getCTime(), //获取inode修改时间    'getExtension' => $file->getExtension(), //文件扩展名    'getFilename' => $file->getFilename(), //获取文件名    'getGroup' => $file->getGroup(), //获取文件组    'getInode' => $file->getInode(), //获取文件inode    'getLinkTarget' => $file->getLinkTarget(), //获取文件链接目标文件    'getMTime' => $file->getMTime(), //获取最后修改时间    'getOwner' => $file->getOwner(), //文件拥有者    'getPath' => $file->getPath(), //不带文件名的文件路径    'getPathInfo' => $file->getPathInfo(), //上级路径的SplFileInfo对象    'getPathname' => $file->getPathname(), //全路径    'getPerms' => $file->getPerms(), //文件权限    'getRealPath' => $file->getRealPath(), //文件绝对路径    'getSize' => $file->getSize(),//文件大小，单位字节    'getType' => $file->getType(),//文件类型 file dir link    'isDir' => $file->isDir(), //是否是目录    'isFile' => $file->isFile(), //是否是文件    'isLink' => $file->isLink(), //是否是快捷链接    'isExecutable' => $file->isExecutable(), //是否可执行    'isReadable' => $file->isReadable(), //是否可读    'isWritable' => $file->isWritable(), //是否可写));

try {    foreach(new SplFileObject('foo-bar.txt') as $line) {        echo $line;    }} catch (Exception $e) {    echo $e->getMessage();}

try {    $file = new SplFileObject('foo-bar.txt');    $file->seek(2);    echo $file->current();} catch (Exception $e) {    echo $e->getMessage();}

$list  = array (    array( 'aaa' ,  'bbb' ,  'ccc' ,  'dddd' ),    array( '123' ,  '456' ,  '7891' )); $file  = new  SplFileObject ( 'file.csv' ,  'w' ); foreach ( $list  as  $fields ) {    $file -> fputcsv ( $fields );}

<?phptry{  /*** class create new DirectoryIterator Object ***/    foreach ( new DirectoryIterator('./') as $Item )        {        echo $Item.'<br />';        }    }/*** if an exception is thrown, catch it here ***/catch(Exception $e){    echo 'No files Found!<br />';}?>

<?php/*** a simple array ***/$array = array('koala', 'kangaroo', 'wombat', 'wallaby', 'emu', 'kiwi', 'kookaburra', 'platypus');/*** create the array object ***/$arrayObj = new ArrayObject($array);/*** iterate over the array ***/for($iterator = $arrayObj->getIterator();   /*** check if valid ***/   $iterator->valid();   /*** move to the next array member ***/   $iterator->next())    {    /*** output the key and current array value ***/    echo $iterator->key() . ' => ' . $iterator->current() . '<br />';    }?>

<?php/*** a simple array ***/$array = array('koala', 'kangaroo', 'wombat', 'wallaby', 'emu', 'kiwi', 'kookaburra', 'platypus');try {    $object = new ArrayIterator($array);    foreach($object as $key=>$value)        {        echo $key.' => '.$value.'<br />';        }    }catch (Exception $e)    {    echo $e->getMessage();    }?>