install.php

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            'shortcut' => 'rs',
            'options' => array(
            ),
            'doc' => '<package>
Run post-installation scripts in package <package>, if any exist.
'),
    );

    // }}}
    // {{{ constructor

    /**
     * PEAR_Command_Install constructor.
     *
     * @access public
     */
    function PEAR_Command_Install(&$ui, &$config)
    {
        parent::PEAR_Command_Common($ui, $config);
    }

    // }}}

    /**
     * For unit testing purposes
     */
    function &getDownloader(&$ui, $options, &$config)
    {
        if (!class_exists('PEAR_Downloader')) {
            require_once 'PEAR/Downloader.php';
        }
        $a = &new PEAR_Downloader($ui, $options, $config);
        return $a;
    }

    /**
     * For unit testing purposes
     */
    function &getInstaller(&$ui)
    {
        if (!class_exists('PEAR_Installer')) {
            require_once 'PEAR/Installer.php';
        }
        $a = &new PEAR_Installer($ui);
        return $a;
    }

    function enableExtension($binaries, $type)
    {
        if (!($phpini = $this->config->get('php_ini', null, 'pear.php.net'))) {
            return PEAR::raiseError('configuration option "php_ini" is not set to php.ini location');
        }
        $ini = $this->_parseIni($phpini);
        if (PEAR::isError($ini)) {
            return $ini;
        }
        $fp = @fopen($phpini, 'wb');
        if (!$fp) {
            return PEAR::raiseError('cannot open php.ini "' . $phpini . '" for writing');
        }
        $line = 0;
        if ($type == 'extsrc' || $type == 'extbin') {
            $search = 'extensions';
            $enable = 'extension';
        } else {
            $search = 'zend_extensions';
            ob_start();
            phpinfo(INFO_GENERAL);
            $info = ob_get_contents();
            ob_end_clean();
            $debug = function_exists('leak') ? '_debug' : '';
            $ts = preg_match('Thread Safety.+enabled', $info) ? '_ts' : '';
            $enable = 'zend_extension' . $debug . $ts;
        }
        foreach ($ini[$search] as $line => $extension) {
            if (in_array($extension, $binaries, true) || in_array(
                  $ini['extension_dir'] . DIRECTORY_SEPARATOR . $extension, $binaries, true)) {
                // already enabled - assume if one is, all are
                return true;
            }
        }
        if ($line) {
            $newini = array_slice($ini['all'], 0, $line);
        } else {
            $newini = array();
        }
        foreach ($binaries as $binary) {
            if ($ini['extension_dir']) {
                $binary = basename($binary);
            }
            $newini[] = $enable . '="' . $binary . '"' . (OS_UNIX ? "\n" : "\r\n");
        }
        $newini = array_merge($newini, array_slice($ini['all'], $line));
        foreach ($newini as $line) {
            fwrite($fp, $line);
        }
        fclose($fp);
        return true;
    }

    function disableExtension($binaries, $type)
    {
        if (!($phpini = $this->config->get('php_ini', null, 'pear.php.net'))) {
            return PEAR::raiseError('configuration option "php_ini" is not set to php.ini location');
        }
        $ini = $this->_parseIni($phpini);
        if (PEAR::isError($ini)) {
            return $ini;
        }
        $line = 0;
        if ($type == 'extsrc' || $type == 'extbin') {
            $search = 'extensions';
            $enable = 'extension';
        } else {
            $search = 'zend_extensions';
            ob_start();
            phpinfo(INFO_GENERAL);
            $info = ob_get_contents();
            ob_end_clean();
            $debug = function_exists('leak') ? '_debug' : '';
            $ts = preg_match('Thread Safety.+enabled', $info) ? '_ts' : '';
            $enable = 'zend_extension' . $debug . $ts;
        }
        $found = false;
        foreach ($ini[$search] as $line => $extension) {
            if (in_array($extension, $binaries, true) || in_array(
                  $ini['extension_dir'] . DIRECTORY_SEPARATOR . $extension, $binaries, true)) {
                $found = true;
                break;
            }
        }
        if (!$found) {
            // not enabled
            return true;
        }
        $fp = @fopen($phpini, 'wb');
        if (!$fp) {
            return PEAR::raiseError('cannot open php.ini "' . $phpini . '" for writing');
        }
        if ($line) {
            $newini = array_slice($ini['all'], 0, $line);
            // delete the enable line
            $newini = array_merge($newini, array_slice($ini['all'], $line + 1));
        } else {
            $newini = array_slice($ini['all'], 1);
        }
        foreach ($newini as $line) {
            fwrite($fp, $line);
        }
        fclose($fp);
        return true;
    }

    function _parseIni($filename)
    {
        if (file_exists($filename)) {
            if (filesize($filename) > 300000) {
                return PEAR::raiseError('php.ini "' . $filename . '" is too large, aborting');
            }
            ob_start();
            phpinfo(INFO_GENERAL);
            $info = ob_get_contents();
            ob_end_clean();
            $debug = function_exists('leak') ? '_debug' : '';
            $ts = preg_match('/Thread Safety.+enabled/', $info) ? '_ts' : '';
            $zend_extension_line = 'zend_extension' . $debug . $ts;
            $all = @file($filename);
            if (!$all) {
                return PEAR::raiseError('php.ini "' . $filename .'" could not be read');
            }
            $zend_extensions = $extensions = array();
            // assume this is right, but pull from the php.ini if it is found
            $extension_dir = ini_get('extension_dir');
            foreach ($all as $linenum => $line) {
                $line = trim($line);
                if (!$line) {
                    continue;
                }
                if ($line[0] == ';') {
                    continue;
                }
                if (strtolower(substr($line, 0, 13)) == 'extension_dir') {
                    $line = trim(substr($line, 13));
                    if ($line[0] == '=') {
                        $x = trim(substr($line, 1));
                        $x = explode(';', $x);
                        $extension_dir = str_replace('"', '', array_shift($x));
                        continue;
                    }
                }
                if (strtolower(substr($line, 0, 9)) == 'extension') {
                    $line = trim(substr($line, 9));
                    if ($line[0] == '=') {
                        $x = trim(substr($line, 1));
                        $x = explode(';', $x);
                        $extensions[$linenum] = str_replace('"', '', array_shift($x));
                        continue;
                    }
                }
                if (strtolower(substr($line, 0, strlen($zend_extension_line))) ==
                      $zend_extension_line) {
                    $line = trim(substr($line, strlen($zend_extension_line)));
                    if ($line[0] == '=') {
                        $x = trim(substr($line, 1));
                        $x = explode(';', $x);
                        $zend_extensions[$linenum] = str_replace('"', '', array_shift($x));
                        continue;
                    }
                }
            }
            return array(
                'extensions' => $extensions,
                'zend_extensions' => $zend_extensions,
                'extension_dir' => $extension_dir,
                'all' => $all,
            );
        } else {
            return PEAR::raiseError('php.ini "' . $filename . '" does not exist');
        }
    }

    // {{{ doInstall()

    function doInstall($command, $options, $params)
    {
        if (!class_exists('PEAR/PackageFile.php')) {
            require_once 'PEAR/PackageFile.php';
        }
        if (empty($this->installer)) {
            $this->installer = &$this->getInstaller($this->ui);
        }
        if ($command == 'upgrade' || $command == 'upgrade-all') {
            $options['upgrade'] = true;
        } else {
            $packages = $params;
        }
        if (isset($options['installroot']) && isset($options['packagingroot'])) {
            return $this->raiseError('ERROR: cannot use both --installroot and --packagingroot');
        }
        $reg = &$this->config->getRegistry();
        $instreg = &$reg; // instreg used to check if package is installed
        if (isset($options['packagingroot']) && !isset($options['upgrade'])) {
            $packrootphp_dir = $this->installer->_prependPath(
                $this->config->get('php_dir', null, 'pear.php.net'),
                $options['packagingroot']);
            $instreg = new PEAR_Registry($packrootphp_dir); // other instreg!

            if ($this->config->get('verbose') > 2) {
                $this->ui->outputData('using package root: ' . $options['packagingroot']);
            }
        }
        $abstractpackages = array();
        $otherpackages = array();
        // parse params
        PEAR::staticPushErrorHandling(PEAR_ERROR_RETURN);
        foreach($params as $param) {
            if (strpos($param, 'http://') === 0) {
                $otherpackages[] = $param;
                continue;
            }
            if (strpos($param, 'channel://') === false && @file_exists($param)) {
                if (isset($options['force'])) {
                    $otherpackages[] = $param;
                    continue;
                }
                $pkg = new PEAR_PackageFile($this->config);
                $pf = $pkg->fromAnyFile($param, PEAR_VALIDATE_DOWNLOADING);
                if (PEAR::isError($pf)) {
                    $otherpackages[] = $param;
                    continue;
                }
                if ($reg->packageExists($pf->getPackage(), $pf->getChannel()) &&
                      version_compare($pf->getVersion(), 
                      $reg->packageInfo($pf->getPackage(), 'version', $pf->getChannel()),
                      '<=')) {
                    if ($this->config->get('verbose')) {
                        $this->ui->outputData('Ignoring installed package ' .
                            $reg->parsedPackageNameToString(
                            array('package' => $pf->getPackage(),
                                  'channel' => $pf->getChannel()), true));
                    }
                    continue;
                }
                $otherpackages[] = $param;
                continue;
            }
            $e = $reg->parsePackageName($param, $this->config->get('default_channel'));
            if (PEAR::isError($e)) {
                $otherpackages[] = $param;
            } else {
                $abstractpackages[] = $e;
            }
        }