streamWrapper::dir_readdir

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

streamWrapper::dir_readdirRead entry from directory handle

Descrizione

public streamWrapper::dir_readdir(): string

This method is called in response to readdir().

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

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

Nota:

The return value will be casted to string.

Errori/Eccezioni

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

Esempi

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);
?>

Il precedente esempio visualizzerĂ  qualcosa simile 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"

Vedere anche:

  • readdir() - Legge una voce dall'handle della directory

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