PHP Conference Japan 2024

    streamWrapper::dir_readdir

    (PHP 4 >= 4.3.2, PHP 5, PHP 7, PHP 8)

    streamWrapper::dir_readdir — 從目錄控點讀取項目

    說明

    public streamWrapper::dir_readdir(): 字串

    此方法會在呼叫 readdir() 時被呼叫。

    參數

    此函式沒有參數。

    回傳值

    應回傳代表下一個檔案名的 字串，如果沒有下一個檔案，則回傳 false。

    注意:

    傳回值將會被轉型為 字串。

    錯誤／例外

    如果呼叫此方法失敗（例如：未實作），則會發出 E_WARNING。

    範例

    範例 #1 從 tar 封存中列出檔案

    <?php
    class streamWrapper {
    protected     $fp;

    public function     dir_opendir($path, $options) {
    $url = parse_url($path);

    $path = $url["host"] . $url["path"];

    if (!    is_readable($path)) {
    trigger_error("$path isn't readable for me", E_USER_NOTICE);
    return     false;
    }
    if (!    is_file($path)) {
    trigger_error("$path isn't a file", E_USER_NOTICE);
    return     false;
    }

    $this->fp = fopen($path, "rb");
    return     true;
    }

    public function     dir_readdir() {
    // Extract the header for this entry
    $header = fread($this->fp, 512);
    $data = unpack("a100filename/a8mode/a8uid/a8gid/a12size/a12mtime/a8checksum/a1filetype/a100link/a100linkedfile", $header);

    // Trim the filename and filesize
    $filename = trim($data["filename"]);

    // No filename? We are the end of the archive
    if (!$filename) {
    return     false;
    }

    $octal_bytes = trim($data["size"]);
    // Filesize is defined in octects
    $bytes = octdec($octal_bytes);

    // tar rounds up filesizes up to multiple of 512 bytes (zero filled)
    $rest = $bytes % 512;
    if (    $rest > 0) {
    $bytes += 512 - $rest;
    }

    // Seek over the file
    fseek($this->fp, $bytes, SEEK_CUR);

    return     $filename;
    }

    public function     dir_closedir() {
    return     fclose($this->fp);
    }

    public function     dir_rewinddir() {
    return     fseek($this->fp, 0, SEEK_SET);
    }
    }

    stream_wrapper_register("tar", "streamWrapper");
    $handle = opendir("tar://example.tar");
    while (    false !== ($file = readdir($handle))) {
    var_dump($file);
    }

    echo     "Rewinding..\n";
    rewind($handle);
    var_dump(readdir($handle));

    closedir($handle);
    ?>

    上述範例將輸出類似以下的內容

    string(13) "construct.xml"
string(16) "dir-closedir.xml"
string(15) "dir-opendir.xml"
string(15) "dir-readdir.xml"
string(17) "dir-rewinddir.xml"
string(9) "mkdir.xml"
string(10) "rename.xml"
string(9) "rmdir.xml"
string(15) "stream-cast.xml"
string(16) "stream-close.xml"
string(14) "stream-eof.xml"
string(16) "stream-flush.xml"
string(15) "stream-lock.xml"
string(15) "stream-open.xml"
string(15) "stream-read.xml"
string(15) "stream-seek.xml"
string(21) "stream-set-option.xml"
string(15) "stream-stat.xml"
string(15) "stream-tell.xml"
string(16) "stream-write.xml"
string(10) "unlink.xml"
string(12) "url-stat.xml"
Rewinding..
string(13) "construct.xml"

    參見

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