class RecursiveFileFilterIterator extends FilterIterator {     // 满足条件的扩展名     protected $ext = array('jpg','gif'),

  。

    /**      * 提供 $path 并生成对应的目录迭代器      */     public function __construct($path)     {         parent::__construct(new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path)));     } 。

    /**      * 检查文件扩展名是否满足条件      */     public function accept()     {         $item = $this->getInnerIterator();         if ($item->isFile() && in_array(pathinfo($item->getFilename(), PATHINFO_EXTENSION), $this->ext))         {             return TRUE;         }     } } 。

// 实例化 foreach (new RecursiveFileFilterIterator('D:/history') as $item) {     echo $item . PHP_EOL; } 。

public class DirectoryContents {     public static void main(String[] args) throws IOException     {         File f = new File("."); // current directory 。

  。

        FilenameFilter textFilter = new FilenameFilter()         {             public boolean accept(File dir, String name)             {                 String lowercaseName = name.toLowerCase();                 if (lowercaseName.endsWith(".txt"))                 {                     return true;                 }                 else                 {                     return false;                 }             }         },

        File[] files = f.listFiles(textFilter),

        for (File file : files)         {             if (file.isDirectory())             {                 System.out.print("directory:");             }             else             {                 System.out.print("     file:");             } 。

            System.out.println(file.getCanonicalPath());         }     } } 。

$post_ =array (  'author' => 'Gonn',  'mail'=>'gonn@nowamagic.net',  'url'=>'http://www.nowamagic.net/',  'text'=>'欢迎访问简明现代魔法'),

  。

$data=http_build_query($post_); $fp = fsockopen("nowamagic.net", 80, $errno, $errstr, 5),

$out="POST http://nowamagic.net/news/1/comment HTTP/1.1\r\n"; $out.="Host: typecho.org\r\n"; $out.="User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13"."\r\n"; $out.="Content-type: application/x-www-form-urlencoded\r\n"; $out.="PHPSESSID=082b0cc33cc7e6df1f87502c456c3eb0\r\n"; $out.="Content-Length: " . strlen($data) . "\r\n"; $out.="Connection: close\r\n\r\n"; $out.=$data."\r\n\r\n",

fwrite($fp, $out); while (!feof($fp)) {     echo fgets($fp, 1280); } 。

fclose($fp),

$fp = stream_socket_client("tcp://nowamagic.net:80", $errno, $errstr, 3);

$opts = array (  'http'=>array(     'method' => 'POST',     'header'=> "Content-type: application/x-www-form-urlencoded\r\n" .       "Content-Length: " . strlen($data) . "\r\n",     'content' => $data) ),

  。

$context = stream_context_create($opts); file_get_contents('http://www.zzvips.com/news', false, $context),

new DataOutputStream(new BufferedOutputStream(new FileOutputStream(new File(fileName))));

$fp = fopen('c:/test.txt', 'w+'),

  。

/* 把rot13过滤器作用在写入流上 */ stream_filter_append($fp, "string.rot13", STREAM_FILTER_WRITE),

/* 写入的数据经过rot13过滤器的处理*/ fwrite($fp, "This is a test\n"); rewind($fp),

/* 读取写入的数据，独到的自然是被处理过的字符了 */ fpassthru($fp); fclose($fp),

// output：Guvf vf n grfg 。

streamlist = stream_get_filters();
print_r($streamlist);

Array
(
    [0] => convert.iconv.*
    [1] => mcrypt.*
    [2] => mdecrypt.*
    [3] => string.rot13
    [4] => string.toupper
    [5] => string.tolower
    [6] => string.strip_tags
    [7] => convert.*
    [8] => consumed
    [9] => dechunk
    [10] => zlib.*
    [11] => bzip2.*
)

class md5_filter extends php_user_filter {     function filter($in, $out, &$consumed, $closing)     {         while ($bucket = stream_bucket_make_writeable($in))         {             $bucket->data = md5($bucket->data);             $consumed += $bucket->datalen;             stream_bucket_append($out, $bucket);         } 。

  。

        //数据处理成功，可供其它管道读取         return PSFS_PASS_ON;     } } stream_filter_register("string.md5", "md5_filter"),

class md5_filter extends php_user_filter {     public function filter($in, $out, &$consumed, $closing)     {         $data="";         while ($bucket = stream_bucket_make_writeable($in))         {             $bucket->data = md5($bucket->data);             $consumed += $bucket->datalen;             stream_bucket_append($out, $bucket);         } 。

  。

        call_user_func($this->params, $data);         return PSFS_PASS_ON;     } } 。

$callback = function($data) {     file_put_contents("c:\log.txt",date("Y-m-d H:i")."\r\n"); },

stream_filter_prepend($fp, "string.md5", STREAM_FILTER_WRITE,$callback);