config.php

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                    break;
                }
                case 'mask': {
                    $data[$key] = decoct($data[$key]);
                    break;
                }
            }
        }
        return true;
    }

    // }}}
    // {{{ getDefaultChannel([layer])
    /**
     * Retrieve the default channel.
     *
     * On startup, channels are not initialized, so if the default channel is not
     * pear.php.net, then initialize the config.
     * @param string registry layer
     * @return string|false
     */
    function getDefaultChannel($layer = null)
    {
        $ret = false;
        if ($layer === null) {
            foreach ($this->layers as $layer) {
                if (isset($this->configuration[$layer]['default_channel'])) {
                    $ret = $this->configuration[$layer]['default_channel'];
                    break;
                }
            }
        } elseif (isset($this->configuration[$layer]['default_channel'])) {
            $ret = $this->configuration[$layer]['default_channel'];
        }
        if ($ret == 'pear.php.net' && defined('PEAR_RUNTYPE') && PEAR_RUNTYPE == 'pecl') {
            $ret = 'pecl.php.net';
        }
        if ($ret) {
            if ($ret != 'pear.php.net') {
                $this->_lazyChannelSetup();
            }
            return $ret;
        }
        return PEAR_CONFIG_DEFAULT_CHANNEL;
    }

    // {{{ get(key, [layer])
    /**
     * Returns a configuration value, prioritizing layers as per the
     * layers property.
     *
     * @param string config key
     *
     * @return mixed the config value, or NULL if not found
     *
     * @access public
     */
    function get($key, $layer = null, $channel = false)
    {
        if (!isset($this->configuration_info[$key])) {
            return null;
        }
        if ($key == '__channels') {
            return null;
        }
        if ($key == 'default_channel') {
            return $this->getDefaultChannel($layer);
        }
        if (!$channel) {
            $channel = $this->getDefaultChannel();
        } elseif ($channel != 'pear.php.net') {
            $this->_lazyChannelSetup();
        }
        $channel = strtolower($channel);
        
        $test = (in_array($key, $this->_channelConfigInfo)) ?
            $this->_getChannelValue($key, $layer, $channel) :
            null;
        if ($test !== null) {
            if ($this->_installRoot) {
                if (in_array($this->getGroup($key),
                      array('File Locations', 'File Locations (Advanced)')) &&
                      $this->getType($key) == 'directory') {
                    return $this->_prependPath($test, $this->_installRoot);
                }
            }
            return $test;
        }
        if ($layer === null) {
            foreach ($this->layers as $layer) {
                if (isset($this->configuration[$layer][$key])) {
                    $test = $this->configuration[$layer][$key];
                    if ($this->_installRoot) {
                        if (in_array($this->getGroup($key),
                              array('File Locations', 'File Locations (Advanced)')) &&
                              $this->getType($key) == 'directory') {
                            return $this->_prependPath($test, $this->_installRoot);
                        }
                    }
                    if ($key == 'preferred_mirror') {
                        $reg = &$this->getRegistry();
                        if (is_object($reg)) {
                            $chan = &$reg->getChannel($channel);
                            if (!$chan->getMirror($test) && $chan->getName() != $test) {
                                return $channel; // mirror does not exist
                            }
                        }
                    }
                    return $test;
                }
            }
        } elseif (isset($this->configuration[$layer][$key])) {
            $test = $this->configuration[$layer][$key];
            if ($this->_installRoot) {
                if (in_array($this->getGroup($key),
                      array('File Locations', 'File Locations (Advanced)')) &&
                      $this->getType($key) == 'directory') {
                    return $this->_prependPath($test, $this->_installRoot);
                }
            }
            if ($key == 'preferred_mirror') {
                $reg = &$this->getRegistry();
                if (is_object($reg)) {
                    $chan = &$reg->getChannel($channel);
                    if (!$chan->getMirror($test) && $chan->getName() != $test) {
                        return $channel; // mirror does not exist
                    }
                }
            }
            return $test;
        }
        return null;
    }

    // }}}
    // {{{ _getChannelValue(key, value, [layer])
    /**
     * Returns a channel-specific configuration value, prioritizing layers as per the
     * layers property.
     *
     * @param string config key
     *
     * @return mixed the config value, or NULL if not found
     *
     * @access private
     */
    function _getChannelValue($key, $layer, $channel)
    {
        if ($key == '__channels' || $channel == 'pear.php.net') {
            return null;
        }
        $ret = null;
        if ($layer === null) {
            foreach ($this->layers as $ilayer) {
                if (isset($this->configuration[$ilayer]['__channels'][$channel][$key])) {
                    $ret = $this->configuration[$ilayer]['__channels'][$channel][$key];
                    break;
                }
            }
        } elseif (isset($this->configuration[$layer]['__channels'][$channel][$key])) {
            $ret = $this->configuration[$layer]['__channels'][$channel][$key];
        }
        if ($key == 'preferred_mirror') {
            if ($ret !== null) {
                $reg = &$this->getRegistry($layer);
                if (is_object($reg)) {
                    $chan = &$reg->getChannel($channel);
                    if (!$chan->getMirror($ret) && $chan->getName() != $ret) {
                        return $channel; // mirror does not exist
                    }
                }
                return $ret;
            }
            if ($channel == $this->getDefaultChannel($layer)) {
                return $channel; // we must use the channel name as the preferred mirror
                                 // if the user has not chosen an alternate
            } else {
                return $this->getDefaultChannel($layer);
            }
        }
        return $ret;
    }


    // }}}
    // {{{ set(key, value, [layer])

    /**
     * Set a config value in a specific layer (defaults to 'user').
     * Enforces the types defined in the configuration_info array.  An
     * integer config variable will be cast to int, and a set config
     * variable will be validated against its legal values.
     *
     * @param string config key
     * @param string config value
     * @param string (optional) config layer
     * @param string channel to set this value for, or null for global value
     * @return bool TRUE on success, FALSE on failure
     */
    function set($key, $value, $layer = 'user', $channel = false)
    {
        if ($key == '__channels') {
            return false;
        }
        if (!isset($this->configuration[$layer])) {
            return false;
        }
        if ($key == 'default_channel') {
            // can only set this value globally
            $channel = 'pear.php.net';
            if ($value != 'pear.php.net') {
                $this->_lazyChannelSetup($layer);
            }
        }
        if ($key == 'preferred_mirror') {
            if ($channel == '__uri') {
                return false; // can't set the __uri pseudo-channel's mirror
            }
            $reg = &$this->getRegistry($layer);
            if (is_object($reg)) {
                $chan = &$reg->getChannel($channel ? $channel : 'pear.php.net');
                if (!$chan->getMirror($value) && $chan->getName() != $value) {
                    return false; // mirror does not exist
                }
            }
        }
        if (empty($this->configuration_info[$key])) {
            return false;
        }
        extract($this->configuration_info[$key]);
        switch ($type) {
            case 'integer':
                $value = (int)$value;
                break;
            case 'set': {
                // If a valid_set is specified, require the value to
                // be in the set.  If there is no valid_set, accept
                // any value.
                if ($valid_set) {
                    reset($valid_set);
                    if ((key($valid_set) === 0 && !in_array($value, $valid_set)) ||
                        (key($valid_set) !== 0 && empty($valid_set[$value])))
                    {
                        return false;
                    }
                }
                break;
            }
        }
        if (!$channel) {
            $channel = $this->get('default_channel', null, 'pear.php.net');
        }
        if (!in_array($channel, $this->_channels)) {
            $this->_lazyChannelSetup($layer);
            $reg = &$this->getRegistry($layer);
            if ($reg) {
                $channel = $reg->channelName($channel);
            }
            if (!in_array($channel, $this->_channels)) {
                return false;
            }
        }
        if ($channel != 'pear.php.net') {
            if (in_array($key, $this->_channelConfigInfo)) {
                $this->configuration[$layer]['__channels'][$channel][$key] = $value;
                return true;
            } else {
                return false;
            }
        } else {
            if ($key == 'default_channel') {
                if (!isset($reg)) {
                    $reg = &$this->getRegistry($layer);
                    if (!$reg) {
                        $reg = &$this->getRegistry();
                    }
                }
                if ($reg) {
                    $value = $reg->channelName($value);
                }
                if (!$value) {
                    return false;
                }
            }
        }
        $this->configuration[$layer][$key] = $value;
        if ($key == 'php_dir' && !$this->_noRegistry) {
            if (!isset($this->_registry[$layer]) ||
                  $value != $this->_registry[$layer]->install_dir) {
                $this->_registry[$layer] = &new PEAR_Registry($value);
                $this->_regInitialized[$layer] = false;
                $this->_registry[$layer]->setConfig($this);
            }
        }
        return true;
    }

    // }}}
    function _lazyChannelSetup($uselayer = false)
    {
        if ($this->_noRegistry) {
            return;
        }
        $merge = false;
        foreach ($this->_registry as $layer => $p) {
            if ($uselayer && $uselayer != $layer) {
                continue;
            }
            if (!$this->_regInitialized[$layer]) {
                if ($layer == 'default' && isset($this->_registry['user']) ||
                      isset($this->_registry['system'])) {
                    // only use the default registry if there are no alternatives
                    continue;
                }
                if (!is_object($this->_registry[$layer])) {
                    if ($phpdir = $this->get('php_dir', $layer, 'pear.php.net')) {
                        $this->_registry[$layer] = &new PEAR_Registry($phpdir);
                        $this->_registry[$layer]->setConfig($this);
                        $this->_regInitialized[$layer] = false;
                    } else {
                        unset($this->_registry[$layer]);
                        return;
                    }
                }
                $this->setChannels($this->_registry[$layer]->listChannels(), $merge);
                $this->_regInitialized[$layer] = true;
                $merge = true;
            }
        }
    }
    // {{{ setChannels()
    
    /**
     * Set the list of channels.
     *
     * This should be set via a call to {@link PEAR_Registry::listChannels()}
     * @param array
     * @param bool
     * @return bool success of operation
     */
    function setChannels($channels, $merge = false)
    {
        if (!is_array($channels)) {
            return false;
        }
        if ($merge) {
            $this->_channels = array_merge($this->_channels, $channels);
        } else {
            $this->_channels = $channels;
        }
        foreach ($channels as $channel) {
            $channel = strtolower($channel);
            if ($channel == 'pear.php.net') {
                continue;
            }
            foreach ($this->layers as $layer) {
                if (!isset($this->configuration[$layer]['__channels'][$channel])
                      || !is_array($this->configuration[$layer]['__channels'][$channel])) {
                    $this->configuration[$layer]['__channels'][$channel] = array();
                }
            }
        }
        return true;
    }

    // }}}
    // {{{ getType(key)

    /**
     * Get the type of a config value.
     *
     * @param string  config key
     *
     * @return string type, one of "string", "integer", "file",
     * "directory", "set" or "password".
     *
     * @access public
     *
     */
    function getType($key)
    {
        if (isset($this->configuration_info[$key])) {
            return $this->configuration_info[$key]['type'];
        }
        return false;
    }

    // }}}