/system/core/Config.php

<?php

if (!defined('BASEPATH'))
    exit('No direct script access allowed');
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */
// ------------------------------------------------------------------------

/**
 * CodeIgniter Config Class
 *
 * This class contains functions that enable config files to be managed
 *
 * @package		CodeIgniter
 * @subpackage	Libraries
 * @category	Libraries
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/libraries/config.html
 */
class CI_Config {

    var $config = array();
    var $is_loaded = array();
    var $_config_paths = array(APPPATH);

    /**
     * Constructor
     *
     * Sets the $config data from the primary config.php file as a class variable
     *
     * @access   public
     * @param   string	the config file name
     * @param   boolean  if configuration values should be loaded into their own section
     * @param   boolean  true if errors should just return false, false if an error message should be displayed
     * @return  boolean  if the file was successfully loaded or not
     */
    function __construct() {
        $this->config = & get_config();
        log_message('debug', "Config Class Initialized");

        // Set the base_url automatically if none was provided
        if ($this->config['base_url'] == '') {
            if (isset($_SERVER['HTTP_HOST'])) {
                $base_url = isset($_SERVER['HTTPS']) && strtolower($_SERVER['HTTPS']) !== 'off' ? 'https' : 'http';
                $base_url .= '://' . $_SERVER['HTTP_HOST'];
                $base_url .= str_replace(basename($_SERVER['SCRIPT_NAME']), '', $_SERVER['SCRIPT_NAME']);
            } else {
                $base_url = 'http://localhost/';
            }

            $this->set_item('base_url', $base_url);
        }
    }

    // --------------------------------------------------------------------

    /**
     * Load Config File
     *
     * @access	public
     * @param	string	the config file name
     * @return	boolean	if the file was loaded correctly
     */
    function load($file = '', $use_sections = FALSE, $fail_gracefully = FALSE) {
        $file = ($file == '') ? 'config' : str_replace(EXT, '', $file);
        $loaded = FALSE;

        foreach ($this->_config_paths as $path) {
            $file_path = $path . 'config/' . $file . EXT;

            if (in_array($file_path, $this->is_loaded, TRUE)) {
                $loaded = TRUE;
                continue;
            }

            if (!file_exists($path . 'config/' . $file . EXT)) {
                continue;
            }

            include($file_path);

            if (!isset($config) OR !is_array($config)) {
                if ($fail_gracefully === TRUE) {
                    return FALSE;
                }
                show_error('Your ' . $file_path . ' file does not appear to contain a valid configuration array.');
            }

            if ($use_sections === TRUE) {
                if (isset($this->config[$file])) {
                    $this->config[$file] = array_merge($this->config[$file], $config);
                } else {
                    $this->config[$file] = $config;
                }
            } else {
                $this->config = array_merge($this->config, $config);
            }

            $this->is_loaded[] = $file_path;
            unset($config);

            $loaded = TRUE;
            log_message('debug', 'Config file loaded: ' . $file_path);
        }

        if ($loaded === FALSE) {
            if ($fail_gracefully === TRUE) {
                return FALSE;
            }
            show_error('The configuration file ' . $file . EXT . ' does not exist.');
        }

        return TRUE;
    }

    // --------------------------------------------------------------------

    /**
     * Fetch a config file item
     *
     *
     * @access	public
     * @param	string	the config item name
     * @param	string	the index name
     * @param	bool
     * @return	string
     */
    function item($item, $index = '') {
        if ($index == '') {
            if (!isset($this->config[$item])) {
                return FALSE;
            }

            $pref = $this->config[$item];
        } else {
            if (!isset($this->config[$index])) {
                return FALSE;
            }

            if (!isset($this->config[$index][$item])) {
                return FALSE;
            }

            $pref = $this->config[$index][$item];
        }

        return $pref;
    }

    // --------------------------------------------------------------------

    /**
     * Fetch a config file item - adds slash after item
     *
     * The second parameter allows a slash to be added to the end of
     * the item, in the case of a path.
     *
     * @access	public
     * @param	string	the config item name
     * @param	bool
     * @return	string
     */
    function slash_item($item) {
        if (!isset($this->config[$item])) {
            return FALSE;
        }

        return rtrim($this->config[$item], '/') . '/';
    }

    // --------------------------------------------------------------------

    /**
     * Site URL
     *
     * @access	public
     * @param	string	the URI string
     * @return	string
     */
    function site_url($uri = '') {
        if ($uri == '') {
            return $this->slash_item('base_url') . $this->item('index_page');
        }

        if ($this->item('enable_query_strings') == FALSE) {
            if (is_array($uri)) {
                $uri = implode('/', $uri);
            }

            $index = $this->item('index_page') == '' ? '' : $this->slash_item('index_page');
            $suffix = ($this->item('url_suffix') == FALSE) ? '' : $this->item('url_suffix');
            return $this->slash_item('base_url') . $index . trim($uri, '/') . $suffix;
        } else {
            if (is_array($uri)) {
                $i = 0;
                $str = '';
                foreach ($uri as $key => $val) {
                    $prefix = ($i == 0) ? '' : '&';
                    $str .= $prefix . $key . '=' . $val;
                    $i++;
                }

                $uri = $str;
            }

            return $this->slash_item('base_url') . $this->item('index_page') . '?' . $uri;
        }
    }

    // --------------------------------------------------------------------

    /**
     * System URL
     *
     * @access	public
     * @return	string
     */
    function system_url() {
        $x = explode("/", preg_replace("|/*(.+?)/*$|", "\\1", BASEPATH));
        return $this->slash_item('base_url') . end($x) . '/';
    }

    // --------------------------------------------------------------------

    /**
     * Set a config file item
     *
     * @access	public
     * @param	string	the config item key
     * @param	string	the config item value
     * @return	void
     */
    function set_item($item, $value) {
        $this->config[$item] = $value;
    }

    // --------------------------------------------------------------------

    /**
     * Assign to Config
     *
     * This function is called by the front controller (CodeIgniter.php)
     * after the Config class is instantiated.  It permits config items
     * to be assigned or overriden by variables contained in the index.php file
     *
     * @access	private
     * @param	array
     * @return	void
     */
    function _assign_to_config($items = array()) {
        if (is_array($items)) {
            foreach ($items as $key => $val) {
                $this->set_item($key, $val);
            }
        }
    }

}

// END CI_Config class

/* End of file Config.php */
/* Location: ./system/core/Config.php */