streamWrapper::dir_opendir
streamWrapper::dir_rewinddir
streamWrapper
PHP Manual

# streamWrapper::dir_readdir

(PHP 4 >= 4.3.2, PHP 5)

streamWrapper::dir_readdir — Read entry from directory handle

### Descripción

public string streamWrapper::dir_readdir ( void )

This method is called in response to readdir().

### Lista de parámetros

This function has no parameters.

### Valores retornados

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

> Note: The return value will be casted to string.

### Errors/Exceptions

Emits `E_WARNING` if call to this method fails (i.e. not implemented).

### Ejemplos

Example #1 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);
?>`

El resultado del ejemplo seria algo similar a:

    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"

### Ver también

- readdir() - Leer una entrada desde un gestor de directorio

streamWrapper::dir_opendir
streamWrapper::dir_rewinddir
streamWrapper
PHP Manual