streamWrapper::dir_readdir

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

    streamWrapper::dir_readdir — Read 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 visualizzerà 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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