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+<?php
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP
+ *
+ * This content is released under the MIT License (MIT)
+ *
+ * Copyright (c) 2014 - 2019, British Columbia Institute of Technology
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ * @package	CodeIgniter
+ * @author	EllisLab Dev Team
+ * @copyright	Copyright (c) 2008 - 2014, EllisLab, Inc. (https://ellislab.com/)
+ * @copyright	Copyright (c) 2014 - 2019, British Columbia Institute of Technology (https://bcit.ca/)
+ * @license	https://opensource.org/licenses/MIT	MIT License
+ * @link	https://codeigniter.com
+ * @since	Version 1.0.0
+ * @filesource
+ */
+defined('BASEPATH') OR exit('No direct script access allowed');
+
+/**
+ * Initialize the database
+ *
+ * @category	Database
+ * @author	EllisLab Dev Team
+ * @link	https://codeigniter.com/user_guide/database/
+ *
+ * @param 	string|string[]	$params
+ * @param 	bool		$query_builder_override
+ *				Determines if query builder should be used or not
+ */
+function &DB($params = '', $query_builder_override = NULL)
+{
+	// Load the DB config file if a DSN string wasn't passed
+	if (is_string($params) && strpos($params, '://') === FALSE)
+	{
+		// Is the config file in the environment folder?
+		if ( ! file_exists($file_path = APPPATH.'config/'.ENVIRONMENT.'/database.php')
+			&& ! file_exists($file_path = APPPATH.'config/database.php'))
+		{
+			show_error('The configuration file database.php does not exist.');
+		}
+
+		include($file_path);
+
+		// Make packages contain database config files,
+		// given that the controller instance already exists
+		if (class_exists('CI_Controller', FALSE))
+		{
+			foreach (get_instance()->load->get_package_paths() as $path)
+			{
+				if ($path !== APPPATH)
+				{
+					if (file_exists($file_path = $path.'config/'.ENVIRONMENT.'/database.php'))
+					{
+						include($file_path);
+					}
+					elseif (file_exists($file_path = $path.'config/database.php'))
+					{
+						include($file_path);
+					}
+				}
+			}
+		}
+
+		if ( ! isset($db) OR count($db) === 0)
+		{
+			show_error('No database connection settings were found in the database config file.');
+		}
+
+		if ($params !== '')
+		{
+			$active_group = $params;
+		}
+
+		if ( ! isset($active_group))
+		{
+			show_error('You have not specified a database connection group via $active_group in your config/database.php file.');
+		}
+		elseif ( ! isset($db[$active_group]))
+		{
+			show_error('You have specified an invalid database connection group ('.$active_group.') in your config/database.php file.');
+		}
+
+		$params = $db[$active_group];
+	}
+	elseif (is_string($params))
+	{
+		/**
+		 * Parse the URL from the DSN string
+		 * Database settings can be passed as discreet
+		 * parameters or as a data source name in the first
+		 * parameter. DSNs must have this prototype:
+		 * $dsn = 'driver://username:password@hostname/database';
+		 */
+		if (($dsn = @parse_url($params)) === FALSE)
+		{
+			show_error('Invalid DB Connection String');
+		}
+
+		$params = array(
+			'dbdriver'	=> $dsn['scheme'],
+			'hostname'	=> isset($dsn['host']) ? rawurldecode($dsn['host']) : '',
+			'port'		=> isset($dsn['port']) ? rawurldecode($dsn['port']) : '',
+			'username'	=> isset($dsn['user']) ? rawurldecode($dsn['user']) : '',
+			'password'	=> isset($dsn['pass']) ? rawurldecode($dsn['pass']) : '',
+			'database'	=> isset($dsn['path']) ? rawurldecode(substr($dsn['path'], 1)) : ''
+		);
+
+		// Were additional config items set?
+		if (isset($dsn['query']))
+		{
+			parse_str($dsn['query'], $extra);
+
+			foreach ($extra as $key => $val)
+			{
+				if (is_string($val) && in_array(strtoupper($val), array('TRUE', 'FALSE', 'NULL')))
+				{
+					$val = var_export($val, TRUE);
+				}
+
+				$params[$key] = $val;
+			}
+		}
+	}
+
+	// No DB specified yet? Beat them senseless...
+	if (empty($params['dbdriver']))
+	{
+		show_error('You have not selected a database type to connect to.');
+	}
+
+	// Load the DB classes. Note: Since the query builder class is optional
+	// we need to dynamically create a class that extends proper parent class
+	// based on whether we're using the query builder class or not.
+	if ($query_builder_override !== NULL)
+	{
+		$query_builder = $query_builder_override;
+	}
+	// Backwards compatibility work-around for keeping the
+	// $active_record config variable working. Should be
+	// removed in v3.1
+	elseif ( ! isset($query_builder) && isset($active_record))
+	{
+		$query_builder = $active_record;
+	}
+
+	require_once(BASEPATH.'database/DB_driver.php');
+
+	if ( ! isset($query_builder) OR $query_builder === TRUE)
+	{
+		require_once(BASEPATH.'database/DB_query_builder.php');
+		if ( ! class_exists('CI_DB', FALSE))
+		{
+			/**
+			 * CI_DB
+			 *
+			 * Acts as an alias for both CI_DB_driver and CI_DB_query_builder.
+			 *
+			 * @see	CI_DB_query_builder
+			 * @see	CI_DB_driver
+			 */
+			class CI_DB extends CI_DB_query_builder { }
+		}
+	}
+	elseif ( ! class_exists('CI_DB', FALSE))
+	{
+		/**
+	 	 * @ignore
+		 */
+		class CI_DB extends CI_DB_driver { }
+	}
+
+	// Load the DB driver
+	$driver_file = BASEPATH.'database/drivers/'.$params['dbdriver'].'/'.$params['dbdriver'].'_driver.php';
+
+	file_exists($driver_file) OR show_error('Invalid DB driver');
+	require_once($driver_file);
+
+	// Instantiate the DB adapter
+	$driver = 'CI_DB_'.$params['dbdriver'].'_driver';
+	$DB = new $driver($params);
+
+	// Check for a subdriver
+	if ( ! empty($DB->subdriver))
+	{
+		$driver_file = BASEPATH.'database/drivers/'.$DB->dbdriver.'/subdrivers/'.$DB->dbdriver.'_'.$DB->subdriver.'_driver.php';
+
+		if (file_exists($driver_file))
+		{
+			require_once($driver_file);
+			$driver = 'CI_DB_'.$DB->dbdriver.'_'.$DB->subdriver.'_driver';
+			$DB = new $driver($params);
+		}
+	}
+
+	$DB->initialize();
+	return $DB;
+}