streamWrapper::dir_readdir
streamWrapper::dir_readdir
(PHP 4 >= 4.3.2, PHP 5, PHP 7)
streamWrapper::dir_readdir - 从目录句柄中读取条目
描述
public string streamWrapper::dir_readdir ( void )
响应readdir()调用此方法。
参数
该函数没有参数。
返回值
应该返回表示下一个文件名的字符串,或者FALSE
没有下一个文件。
注意
:返回值将被转换为字符串。
错误/异常
E_WARNING
如果对此方法的调用失败(即未实现),则发出。
示例
示例#1从tar档案中列出文件
<?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
?>
上面的例子会输出类似于:
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"
另请参阅
- readdir() - 从目录句柄中读取条目
← streamWrapper::dir_opendir
streamWrapper::dir_rewinddir →