Pharに自作スタブをセットする

Pharの基本的な使い方は

- [pharを使ってみる](http://qiita.com/rana_kualu/items/d868604a1f54c2f93a7c)
- [pharアーカイブを作成](http://qiita.com/rana_kualu/items/4b2ef7bfff83939d7ef5)

で紹介されていますが、このままだと`__HALT_COMPILER();`より前のPHPコード領域に挿入されるコードは以下のようなデフォルトのものが適用されてしまいます。

```php
<?php
$web = '000';
if (in_array('phar', stream_get_wrappers()) && class_exists('Phar', 0)) {
    Phar::interceptFileFuncs();
    set_include_path('phar://' . __FILE__ . PATH_SEPARATOR . get_include_path());
    Phar::webPhar(null, $web);
    include 'phar://' . __FILE__ . '/' . Extract_Phar::START;
    return;
}
if (@(isset($_SERVER['REQUEST_URI']) && isset($_SERVER['REQUEST_METHOD']) && ($_SERVER['REQUEST_METHOD'] == 'GET' || $_SERVER['REQUEST_METHOD'] == 'POST'))) {
    Extract_Phar::go(true);
    $mimes = array(
        'phps' => 2,
        'c' => 'text/plain',
        'cc' => 'text/plain',
        'cpp' => 'text/plain',
        'c++' => 'text/plain',
        'dtd' => 'text/plain',
        'h' => 'text/plain',
        'log' => 'text/plain',
        'rng' => 'text/plain',
        'txt' => 'text/plain',
        'xsd' => 'text/plain',
        'php' => 1,
        'inc' => 1,
        'avi' => 'video/avi',
        'bmp' => 'image/bmp',
        'css' => 'text/css',
        'gif' => 'image/gif',
        'htm' => 'text/html',
        'html' => 'text/html',
        'htmls' => 'text/html',
        'ico' => 'image/x-ico',
        'jpe' => 'image/jpeg',
        'jpg' => 'image/jpeg',
        'jpeg' => 'image/jpeg',
        'js' => 'application/x-javascript',
        'midi' => 'audio/midi',
        'mid' => 'audio/midi',
        'mod' => 'audio/mod',
        'mov' => 'movie/quicktime',
        'mp3' => 'audio/mp3',
        'mpg' => 'video/mpeg',
        'mpeg' => 'video/mpeg',
        'pdf' => 'application/pdf',
        'png' => 'image/png',
        'swf' => 'application/shockwave-flash',
        'tif' => 'image/tiff',
        'tiff' => 'image/tiff',
        'wav' => 'audio/wav',
        'xbm' => 'image/xbm',
        'xml' => 'text/xml',
       );
    header("Cache-Control: no-cache, must-revalidate");
    header("Pragma: no-cache");
    $basename = basename(__FILE__);
    if (!strpos($_SERVER['REQUEST_URI'], $basename)) {
        chdir(Extract_Phar::$temp);
        include $web;
        return;
    }
    $pt = substr($_SERVER['REQUEST_URI'], strpos($_SERVER['REQUEST_URI'], $basename) + strlen($basename));
    if (!$pt || $pt == '/') {
        $pt = $web;
        header('HTTP/1.1 301 Moved Permanently');
        header('Location: ' . $_SERVER['REQUEST_URI'] . '/' . $pt);
        exit;
    }
    $a = realpath(Extract_Phar::$temp . DIRECTORY_SEPARATOR . $pt);
    if (!$a || strlen(dirname($a)) < strlen(Extract_Phar::$temp)) {
        header('HTTP/1.0 404 Not Found');
        echo "<html>\n <head>\n  <title>File Not Found<title>\n </head>\n <body>\n  <h1>404 - File ", $pt, " Not Found</h1>\n </body>\n</html>";
        exit;
    }
    $b = pathinfo($a);
    if (!isset($b['extension'])) {
        header('Content-Type: text/plain');
        header('Content-Length: ' . filesize($a));
        readfile($a);
        exit;
    }
    if (isset($mimes[$b['extension']])) {
        if ($mimes[$b['extension']] === 1) {
            include $a;
            exit;
        }
        if ($mimes[$b['extension']] === 2) {
            highlight_file($a);
            exit;
        }
        header('Content-Type: ' .$mimes[$b['extension']]);
        header('Content-Length: ' . filesize($a));
        readfile($a);
        exit;
    }
}
class Extract_Phar
{
    static $temp;
    static $origdir;
    const GZ = 0x1000;
    const BZ2 = 0x2000;
    const MASK = 0x3000;
    const START = 'index.php';
    const LEN = XXXX;
    static function go($return  = false)
    {
        $fp = fopen(__FILE__, 'rb');
        fseek($fp, self::LEN);
        $L = unpack('V', $a = (binary)fread($fp, 4));
        $m = (binary)'';
        do {
            $read = 8192;
            if ($L[1] - strlen($m) < 8192) {
                $read = $L[1] - strlen($m);
            }
            $last = (binary)fread($fp, $read);
            $m .= $last;
        } while (strlen($last) && strlen($m) < $L[1]);
        if (strlen($m) < $L[1]) {
            die('ERROR: manifest length read was "' . 
                strlen($m) .'" should be "' .
                $L[1] . '"');
        }
        $info = self::_unpack($m);
        $f = $info['c'];
        if ($f & self::GZ) {
            if (!function_exists('gzinflate')) {
                die('Error: zlib extension is not enabled -' .
                    ' gzinflate() function needed for zlib-compressed .phars');
            }
        }
        if ($f & self::BZ2) {
            if (!function_exists('bzdecompress')) {
                die('Error: bzip2 extension is not enabled -' .
                    ' bzdecompress() function needed for bz2-compressed .phars');
            }
        }
        $temp = self::tmpdir();
        if (!$temp || !is_writable($temp)) {
            $sessionpath = session_save_path();
            if (strpos ($sessionpath, ";") !== false)
                $sessionpath = substr ($sessionpath, strpos ($sessionpath, ";")+1);
            if (!file_exists($sessionpath) || !is_dir($sessionpath)) {
                die('Could not locate temporary directory to extract phar');
            }
            $temp = $sessionpath;
        }
        $temp .= '/pharextract/'.basename(__FILE__, '.phar');
        self::$temp = $temp;
        self::$origdir = getcwd();
        @mkdir($temp, 0777, true);
        $temp = realpath($temp);
        if (!file_exists($temp . DIRECTORY_SEPARATOR . md5_file(__FILE__))) {
            self::_removeTmpFiles($temp, getcwd());
            @mkdir($temp, 0777, true);
            @file_put_contents($temp . '/' . md5_file(__FILE__), '');
            foreach ($info['m'] as $path => $file) {
                $a = !file_exists(dirname($temp . '/' . $path));
                @mkdir(dirname($temp . '/' . $path), 0777, true);
                clearstatcache();
                if ($path[strlen($path) - 1] == '/') {
                    @mkdir($temp . '/' . $path, 0777);
                } else {
                    file_put_contents($temp . '/' . $path, self::extractFile($path, $file, $fp));
                    @chmod($temp . '/' . $path, 0666);
                }
            }
        }
        chdir($temp);
        if (!$return) {
            include self::START;
        }
    }
    static function tmpdir()
    {
        if (strpos(PHP_OS, 'WIN') !== false) {
            if ($var = getenv('TMP') ? getenv('TMP') : getenv('TEMP')) {
                return $var;
            }
            if (is_dir('/temp') || mkdir('/temp')) {
                return realpath('/temp');
            }
            return false;
        }
        if ($var = getenv('TMPDIR')) {
            return $var;
        }
        return realpath('/tmp');
    }
    static function _unpack($m)
    {
        $info = unpack('V', substr($m, 0, 4));
        // skip API version, phar flags, alias, metadata
        $l = unpack('V', substr($m, 10, 4));
        $m = substr($m, 14 + $l[1]);
        $s = unpack('V', substr($m, 0, 4));
        $o = 0;
        $start = 4 + $s[1];
        $ret['c'] = 0;
        for ($i = 0; $i < $info[1]; $i++) {
            // length of the file name
            $len = unpack('V', substr($m, $start, 4));
            $start += 4;
            // file name
            $savepath = substr($m, $start, $len[1]);
            $start += $len[1];
            // retrieve manifest data:
            // 0 = size, 1 = timestamp, 2 = compressed size, 3 = crc32, 4 = flags
            // 5 = metadata length
            $ret['m'][$savepath] = array_values(unpack('Va/Vb/Vc/Vd/Ve/Vf', substr($m, $start, 24)));
            $ret['m'][$savepath][3] = sprintf('%u', $ret['m'][$savepath][3]
                & 0xffffffff);
            $ret['m'][$savepath][7] = $o;
            $o += $ret['m'][$savepath][2];
            $start += 24 + $ret['m'][$savepath][5];
            $ret['c'] |= $ret['m'][$savepath][4] & self::MASK;
        }
        return $ret;
    }
    static function extractFile($path, $entry, $fp)
    {
        $data = '';
        $c = $entry[2];
        while ($c) {
            if ($c < 8192) {
                $data .= @fread($fp, $c);
                $c = 0;
            } else {
                $c -= 8192;
                $data .= @fread($fp, 8192);
            }
        }
        if ($entry[4] & self::GZ) {
            $data = gzinflate($data);
        } elseif ($entry[4] & self::BZ2) {
            $data = bzdecompress($data);
        }
        if (strlen($data) != $entry[0]) {
            die("Invalid internal .phar file (size error " . strlen($data) . " != " .
                $stat[7] . ")");
        }
        if ($entry[3] != sprintf("%u", crc32((binary)$data) & 0xffffffff)) {
            die("Invalid internal .phar file (checksum error)");
        }
        return $data;
    }
    static function _removeTmpFiles($temp, $origdir)
    {
        chdir($temp);
        foreach (glob('*') as $f) {
            if (file_exists($f)) {
                is_dir($f) ? @rmdir($f) : @unlink($f);
                if (file_exists($f) && is_dir($f)) {
                    self::_removeTmpFiles($f, getcwd());
                }
            }
        }
        @rmdir($temp);
        clearstatcache();
        chdir($origdir);
    }
}
```

**「どうしてこうなった」** って感じなので、もうちょっときれいにしたいですよね。そこで自作のスタブをセットしてみましょう。実は `composer.phar` もこの手段を採っています。

```php:src以下にあるPHPファイルを全てbuild/test.pharにまとめる
$pharpath = __DIR__ . '/build/test.phar';
if (is_file($pharpath)) {
    unlink($pharpath);
}
$phar = new \Phar($pharpath, 0, basename($pharpath));
$phar->setStub('<?php
spl_autoload_register(function ($class) {
    $path = "phar://" . __FILE__ . DIRECTORY_SEPARATOR .
             str_replace("\\", DIRECTORY_SEPARATOR, $class) . ".php";
    if (is_file($path)) {
        require $path;
    }
});
__HALT_COMPILER(); ?>
');
$phar->buildFromDirectory(__DIR__ . '/src', '/\.php\z/');
```

実際にこれを利用するときは(正しくスタブを書いていれば)従来通り以下のコードでOKです。

```php
require 'test.phar';
```