PHPのお勉強！

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    例

    rar:// ラッパー の例も参照ください。

    例1 オンザフライでの復元

    <?php

    if (!array_key_exists("i", $_GET) || !is_numeric($_GET["i"]))
    die(    "Index unspecified or non-numeric");
    $index = (int) $_GET["i"];

    $arch = RarArchive::open("example.rar");
    if (    $arch === FALSE)
    die(    "Cannot open example.rar");

    $entries = $arch->getEntries();
    if (    $entries === FALSE)
    die(    "Cannot retrieve entries");

    if (!    array_key_exists($index, $entries))
    die(    "No such index: $index");

    $orfilename = $entries[$index]->getName(); //UTF-8 encoded

    $filesize = $entries[$index]->getUnpackedSize();

    /* you could check HTTP_IF_MODIFIED_SINCE here and compare with
    * $entries[$index]->getFileTime(). You could also send a
    * "Last modified" header */

    $fp = $entries[$index]->getStream();
    if (    $fp === FALSE)
    die(    "Cannot open file with index $index insided the archive.");

    $arch->close(); //no longer needed; stream is independent

    function detectUserAgent() {
    if (!    array_key_exists('HTTP_USER_AGENT', $_SERVER))
    return     "Other";

    $uas = $_SERVER['HTTP_USER_AGENT'];
    if (    preg_match("@Opera/@", $uas))
    return     "Opera";
    if (    preg_match("@Firefox/@", $uas))
    return     "Firefox";
    if (    preg_match("@Chrome/@", $uas))
    return     "Chrome";
    if (    preg_match("@MSIE ([0-9.]+);@", $uas, $matches)) {
    if (((float)     $matches[1]) >= 7.0)
    return     "IE";
    }

    return     "Other";
    }

    /*
    * We have 3 options:
    * - For FF and Opera, which support RFC 2231, use that format.
    * - For IE and Chrome, use attwithfnrawpctenclong
    * (http://greenbytes.de/tech/tc2231/#attwithfnrawpctenclong)
    * - For the others, convert to ISO-8859-1, if possible
    */
    $formatRFC2231 = 'Content-Disposition: attachment; filename*=UTF-8\'\'%s';
    $formatDef = 'Content-Disposition: attachment; filename="%s"';

    switch (    detectUserAgent()) {
    case     "Opera":
    case     "Firefox":
    $orfilename = rawurlencode($orfilename);
    $format = $formatRFC2231;
    break;

    case     "IE":
    case     "Chrome":
    $orfilename = rawurlencode($orfilename);
    $format = $formatDef;
    break;
    default:
    if (    function_exists('iconv'))
    $orfilename =
    @    iconv("UTF-8", "ISO-8859-1//TRANSLIT", $orfilename);
    $format = $formatDef;
    }

    header(sprintf($format, $orfilename));
    //cannot send error messages from now on (headers already sent)

    //replace by real content type, perhaps infering from the file extension
    $contentType = "application/octet-stream";
    header("Content-Type: $contentType");

    header("Content-Transfer-Encoding: binary");

    header("Content-Length: $filesize");

    if (    $_SERVER['REQUEST_METHOD'] == "HEAD")
    die();

    while (!    feof($fp)) {
    $s = @fread($fp, 8192);
    if (    $s === false)
    break;     //useless to send error messages

    echo $s;
    }
    ?>

    この例は、RAR ファイルを開いて指定したファイルを RAR アーカイブ内から取り出し、 クライアントにダウンロードさせます。

    例2 RAR 拡張モジュールでの展開の例

    <?php

    $rar_file     = rar_open('example.rar') or die("Rar アーカイブをオープンできません。");

    $entries = rar_list($rar_file);

    foreach (    $entries as $entry) {
    echo     'ファイル名: ' . $entry->getName() . "\n";
    echo     '圧縮時のファイルサイズ: ' . $entry->getPackedSize() . "\n";
    echo     '展開後のファイルサイズ: ' . $entry->getUnpackedSize() . "\n";

    $entry->extract('/dir/extract/to/');
    }

    rar_close($rar_file);

    ?>

    この例は Rar アーカイブファイルをオープンし、 指定したディレクトリに個々のファイルを展開します。

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    User Contributed Notes 1 note

    up
    1
    Nitrogen
    14 years ago
    A veeery simple function to RAR files, I'm not proud of it.
    Since there's no way to create RAR files in PHP (due to licensing, patents or whatever), I'm taking some advantage from the command-line RARing tool that comes with WinRAR (in the WinRAR program files named "rar.exe").

    <?php
    function RARFiles($Output='output.rar',$Files=array()) {
    $Data='';
    for(    $i=0;$i<count($Files);$i++)
    $Data.="\"{$Files[$i]}\" ";
    exec("rar.exe a \"{$Output}\" {$Data}");
    }

    $Files=array('file1.ext','file2.ext','file3.ext');
    RARFiles('asdf.rar',$Files);
    // asdf.rar created.
    ?>

    There's no error checking, so make sure you check that your expected RAR file exists before doing anything with it.
    Hopefully one day, PHP will be able to be allowed to create RAR files.
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