config.php

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    // {{{ getDocs(key)

    /**
     * Get the documentation for a config value.
     *
     * @param string  config key
     *
     * @return string documentation string
     *
     * @access public
     *
     */
    function getDocs($key)
    {
        if (isset($this->configuration_info[$key])) {
            return $this->configuration_info[$key]['doc'];
        }
        return false;
    }
       // }}}
    // {{{ getPrompt(key)

    /**
     * Get the short documentation for a config value.
     *
     * @param string  config key
     *
     * @return string short documentation string
     *
     * @access public
     *
     */
    function getPrompt($key)
    {
        if (isset($this->configuration_info[$key])) {
            return $this->configuration_info[$key]['prompt'];
        }
        return false;
    }
    // }}}
    // {{{ getGroup(key)

    /**
     * Get the parameter group for a config key.
     *
     * @param string  config key
     *
     * @return string parameter group
     *
     * @access public
     *
     */
    function getGroup($key)
    {
        if (isset($this->configuration_info[$key])) {
            return $this->configuration_info[$key]['group'];
        }
        return false;
    }

    // }}}
    // {{{ getGroups()

    /**
     * Get the list of parameter groups.
     *
     * @return array list of parameter groups
     *
     * @access public
     *
     */
    function getGroups()
    {
        $tmp = array();
        foreach ($this->configuration_info as $key => $info) {
            $tmp[$info['group']] = 1;
        }
        return array_keys($tmp);
    }

    // }}}
    // {{{ getGroupKeys()

    /**
     * Get the list of the parameters in a group.
     *
     * @param string $group parameter group
     *
     * @return array list of parameters in $group
     *
     * @access public
     *
     */
    function getGroupKeys($group)
    {
        $keys = array();
        foreach ($this->configuration_info as $key => $info) {
            if ($info['group'] == $group) {
                $keys[] = $key;
            }
        }
        return $keys;
    }

    // }}}
    // {{{ getSetValues(key)

    /**
     * Get the list of allowed set values for a config value.  Returns
     * NULL for config values that are not sets.
     *
     * @param string  config key
     *
     * @return array enumerated array of set values, or NULL if the
     *               config key is unknown or not a set
     *
     * @access public
     *
     */
    function getSetValues($key)
    {
        if (isset($this->configuration_info[$key]) &&
            isset($this->configuration_info[$key]['type']) &&
            $this->configuration_info[$key]['type'] == 'set')
        {
            $valid_set = $this->configuration_info[$key]['valid_set'];
            reset($valid_set);
            if (key($valid_set) === 0) {
                return $valid_set;
            }
            return array_keys($valid_set);
        }
        return null;
    }

    // }}}
    // {{{ getKeys()

    /**
     * Get all the current config keys.
     *
     * @return array simple array of config keys
     *
     * @access public
     */
    function getKeys()
    {
        $keys = array();
        foreach ($this->layers as $layer) {
            $test = $this->configuration[$layer];
            if (isset($test['__channels'])) {
                foreach ($test['__channels'] as $channel => $configs) {
                    $keys = array_merge($keys, $configs);
                }
            }
            unset($test['__channels']);
            $keys = array_merge($keys, $test);
        }
        return array_keys($keys);
    }

    // }}}
    // {{{ remove(key, [layer])

    /**
     * Remove the a config key from a specific config layer.
     *
     * @param string config key
     *
     * @param string (optional) config layer
     *
     * @return bool TRUE on success, FALSE on failure
     *
     * @access public
     */
    function remove($key, $layer = 'user')
    {
        $channel = $this->getDefaultChannel();
        if ($channel !== 'pear.php.net') {
            if (isset($this->configuration[$layer]['__channels'][$channel][$key])) {
                unset($this->configuration[$layer]['__channels'][$channel][$key]);
                return true;
            }
        }
        if (isset($this->configuration[$layer][$key])) {
            unset($this->configuration[$layer][$key]);
            return true;
        }
        return false;
    }

    // }}}
    // {{{ removeLayer(layer)

    /**
     * Temporarily remove an entire config layer.  USE WITH CARE!
     *
     * @param string config key
     *
     * @param string (optional) config layer
     *
     * @return bool TRUE on success, FALSE on failure
     *
     * @access public
     */
    function removeLayer($layer)
    {
        if (isset($this->configuration[$layer])) {
            $this->configuration[$layer] = array();
            return true;
        }
        return false;
    }

    // }}}
    // {{{ store([layer])

    /**
     * Stores configuration data in a layer.
     *
     * @param string config layer to store
     *
     * @return bool TRUE on success, or PEAR error on failure
     *
     * @access public
     */
    function store($layer = 'user', $data = null)
    {
        return $this->writeConfigFile(null, $layer, $data);
    }

    // }}}
    // {{{ toDefault(key)

    /**
     * Unset the user-defined value of a config key, reverting the
     * value to the system-defined one.
     *
     * @param string config key
     *
     * @return bool TRUE on success, FALSE on failure
     *
     * @access public
     */
    function toDefault($key)
    {
        trigger_error("PEAR_Config::toDefault() deprecated, use PEAR_Config::remove() instead", E_USER_NOTICE);
        return $this->remove($key, 'user');
    }

    // }}}
    // {{{ definedBy(key)

    /**
     * Tells what config layer that gets to define a key.
     *
     * @param string config key
     * @param boolean return the defining channel
     *
     * @return string|array the config layer, or an empty string if not found.
     *
     *         if $returnchannel, the return is an array array('layer' => layername,
     *         'channel' => channelname), or an empty string if not found
     *
     * @access public
     */
    function definedBy($key, $returnchannel = false)
    {
        foreach ($this->layers as $layer) {
            $channel = $this->getDefaultChannel();
            if ($channel !== 'pear.php.net') {
                if (isset($this->configuration[$layer]['__channels'][$channel][$key])) {
                    if ($returnchannel) {
                        return array('layer' => $layer, 'channel' => $channel);
                    }
                    return $layer;
                }
            }
            if (isset($this->configuration[$layer][$key])) {
                if ($returnchannel) {
                    return array('layer' => $layer, 'channel' => 'pear.php.net');
                }
                return $layer;
            }
        }
        return '';
    }

    // }}}
    // {{{ isDefaulted(key)

    /**
     * Tells whether a config value has a system-defined value.
     *
     * @param string   config key
     *
     * @return bool
     *
     * @access public
     *
     * @deprecated
     */
    function isDefaulted($key)
    {
        trigger_error("PEAR_Config::isDefaulted() deprecated, use PEAR_Config::definedBy() instead", E_USER_NOTICE);
        return $this->definedBy($key) == 'system';
    }

    // }}}
    // {{{ isDefined(key)

    /**
     * Tells whether a given key exists as a config value.
     *
     * @param string config key
     *
     * @return bool whether <config key> exists in this object
     *
     * @access public
     */
    function isDefined($key)
    {
        foreach ($this->layers as $layer) {
            if (isset($this->configuration[$layer][$key])) {
                return true;
            }
        }
        return false;
    }

    // }}}
    // {{{ isDefinedLayer(key)

    /**
     * Tells whether a given config layer exists.
     *
     * @param string config layer
     *
     * @return bool whether <config layer> exists in this object
     *
     * @access public
     */
    function isDefinedLayer($layer)
    {
        return isset($this->configuration[$layer]);
    }

    // }}}
    // {{{ getLayers()

    /**
     * Returns the layers defined (except the 'default' one)
     *
     * @return array of the defined layers
     */
    function getLayers()
    {
        $cf = $this->configuration;
        unset($cf['default']);
        return array_keys($cf);
    }

    // }}}
    // {{{ apiVersion()
    function apiVersion()
    {
        return '1.1';
    }
    // }}}

    /**
     * @return PEAR_Registry
     */
    function &getRegistry($use = null)
    {
        if ($use === null) {
            $layer = 'user';
        } else {
            $layer = $use;
        }
        if (isset($this->_registry[$layer])) {
            return $this->_registry[$layer];
        } elseif ($use === null && isset($this->_registry['system'])) {
            return $this->_registry['system'];
        } elseif ($use === null && isset($this->_registry['default'])) {