(PHP 4 >= 4.3.2, PHP 5, PHP 7)
Read entry from directory handle
public string streamWrapper::dir_readdir ( void )
This method is called in response to readdir().
Returns:
Should return string representing the next filename, or FALSE
if there is no next file.
Note:
The return value will be casted to string.
Exception:
Emits E_WARNING
if call to this method fails (i.e. not implemented).
Examples:
Listing files from tar archives
<?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); ?>
The above example will output something similar to:
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"
See also:
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