Php/docs/streamwrapper.dir-readdir

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• streamWrapper
• Read entry from directory handle

streamWrapper::dir_readdir

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

streamWrapper::dir_readdir — Read entry from directory handle

说明

public streamWrapper::dir_readdir ( ) : string

This method is called in response to readdir().

参数

此函数没有参数。

返回值

Should return string representing the next filename, or false if there is no next file.

Note:

The return value will be casted to string.

错误／异常

调用此方法失败将给出 E_WARNING（未实现）。

范例

Example #1 Listing files from tar archives

<?phpclass 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);?>

以上例程的输出类似于：

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"

参见

• readdir() - 从目录句柄中读取条目