WB 2.08.x

<?php

// $Id: functions.php 672 2008-02-08 17:41:40Z thorn $

/*

 Website Baker Project <http://www.websitebaker.org/>

 Copyright (C) 2004-2008, Ryan Djurovich

 Website Baker is free software; you can redistribute it and/or modify

 it under the terms of the GNU General Public License as published by

 the Free Software Foundation; either version 2 of the License, or

 (at your option) any later version.

 Website Baker is distributed in the hope that it will be useful,

 but WITHOUT ANY WARRANTY; without even the implied warranty of

 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License

 along with Website Baker; if not, write to the Free Software

 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

/*

Website Baker functions file

This file contains general functions used in Website Baker

*/

// Stop this file from being accessed directly

if(!defined('WB_URL')) {

	header('Location: ../index.php');

	exit(0);

}

// Define that this file has been loaded

define('FUNCTIONS_FILE_LOADED', true);

// Function to remove a non-empty directory

function rm_full_dir($directory)

{

    // If suplied dirname is a file then unlink it

    if (is_file($directory)) {

        return unlink($directory);

    }

    // Empty the folder

    $dir = dir($directory);

    while (false !== $entry = $dir->read()) {

        // Skip pointers

        if ($entry == '.' || $entry == '..') {

            continue;

        }

        // Deep delete directories      

        if (is_dir("$directory/$entry")) {

            rm_full_dir("$directory/$entry");

        } else {

            unlink("$directory/$entry");

        }

    }

    // Now delete the folder

    $dir->close();

    return rmdir($directory);

}

// Function to open a directory and add to a dir list

function directory_list($directory) {

	$list = array();

	// Open the directory then loop through its contents

	$dir = dir($directory);

	while (false !== $entry = $dir->read()) {

		// Skip pointers

		if(substr($entry, 0, 1) == '.' || $entry == '.svn') {

			continue;

		}

		// Add dir and contents to list

		if (is_dir("$directory/$entry")) {

			$list = array_merge($list, directory_list("$directory/$entry"));

			$list[] = "$directory/$entry";

		}

	}

	// Now return the list

	return $list;

}

// Function to open a directory and add to a dir list

function chmod_directory_contents($directory, $file_mode) {

	// Set the umask to 0

	$umask = umask(0);

	// Open the directory then loop through its contents

	$dir = dir($directory);

	while (false !== $entry = $dir->read()) {

		// Skip pointers

		if(substr($entry, 0, 1) == '.' || $entry == '.svn') {

			continue;

		}

		// Chmod the sub-dirs contents

		if(is_dir("$directory/$entry")) {

			chmod_directory_contents("$directory/$entry", $file_mode);

		}

		change_mode($directory.'/'.$entry);

	}

	// Restore the umask

	umask($umask);

}

// Function to open a directory and add to a file list

function file_list($directory, $skip = array()) {

	$list = array();

	$skip_file = false;

	// Open the directory then loop through its contents

	$dir = dir($directory);

	while (false !== $entry = $dir->read()) {

		// Skip pointers

		if($entry == '.' || $entry == '..') {

			$skip_file = true;

		}

		// Check if we to skip anything else

		if($skip != array()) {

			foreach($skip AS $skip_name) {

				if($entry == $skip_name) {

					$skip_file = true;

				}

			}

		}

		// Add dir and contents to list

		if($skip_file != true AND is_file("$directory/$entry")) {

			$list[] = "$directory/$entry";

		}

		// Reset the skip file var

		$skip_file = false;

	}

	// Now delete the folder

	return $list;

}

// Function to get a list of home folders not to show

function get_home_folders() {

	global $database, $admin;

	$home_folders = array();

	// Only return home folders is this feature is enabled

	// and user is not admin

//	if(HOME_FOLDERS AND ($_SESSION['GROUP_ID']!='1')) {

	if(HOME_FOLDERS AND (!in_array('1',split(",",$_SESSION['GROUPS_ID'])))) {

		$query_home_folders = $database->query("SELECT home_folder FROM ".TABLE_PREFIX."users WHERE home_folder != '".$admin->get_home_folder()."'");

		if($query_home_folders->numRows() > 0) {

			while($folder = $query_home_folders->fetchRow()) {

				$home_folders[$folder['home_folder']] = $folder['home_folder'];

			}

		}

		function remove_home_subs($directory = '/', $home_folders) {

			if($handle = opendir(WB_PATH.MEDIA_DIRECTORY.$directory)) {

				// Loop through the dirs to check the home folders sub-dirs are not shown

			   while(false !== ($file = readdir($handle))) {

					if(substr($file, 0, 1) != '.' AND $file != '.svn' AND $file != 'index.php') {

						if(is_dir(WB_PATH.MEDIA_DIRECTORY.$directory.'/'.$file)) {

							if($directory != '/') { $file = $directory.'/'.$file; } else { $file = '/'.$file; }

							foreach($home_folders AS $hf) {

								$hf_length = strlen($hf);

								if($hf_length > 0) {

									if(substr($file, 0, $hf_length+1) == $hf) {

										$home_folders[$file] = $file;

									}

								}

							}

							$home_folders = remove_home_subs($file, $home_folders);

						}

					}

				}

			}

			return $home_folders;

		}

		$home_folders = remove_home_subs('/', $home_folders);

	}

	return $home_folders;

}

// Function to create directories

function make_dir($dir_name, $dir_mode = OCTAL_DIR_MODE) {

	if(!file_exists($dir_name)) {

		$umask = umask(0);

		mkdir($dir_name, $dir_mode);

		umask($umask);

		return true;

	} else {

		return false;	

	}

}

// Function to chmod files and directories

function change_mode($name) {

	if(OPERATING_SYSTEM != 'windows') {

		// Only chmod if os is not windows

		if(is_dir($name)) {

			$mode = OCTAL_DIR_MODE;

		} else {

			$mode = OCTAL_FILE_MODE;

		}

		if(file_exists($name)) {

			$umask = umask(0);

			chmod($name, $mode);

			umask($umask);

			return true;

		} else {

			return false;	

		}

	} else {

		return true;

	}

}

// Function to figure out if a parent exists

function is_parent($page_id) {

	global $database;

	// Get parent

	$query = $database->query("SELECT parent FROM ".TABLE_PREFIX."pages WHERE page_id = '$page_id'");

	$fetch = $query->fetchRow();

	// If parent isnt 0 return its ID

	if($fetch['parent'] == '0') {

		return false;

	} else {

		return $fetch['parent'];

	}

}

// Function to work out level

function level_count($page_id) {

	global $database;

	// Get page parent

	$query_page = $database->query("SELECT parent FROM ".TABLE_PREFIX."pages WHERE page_id = '$page_id' LIMIT 1");

	$fetch_page = $query_page->fetchRow();

	$parent = $fetch_page['parent'];

	if($parent > 0) {

		// Get the level of the parent

		$query_parent = $database->query("SELECT level FROM ".TABLE_PREFIX."pages WHERE page_id = '$parent' LIMIT 1");

		$fetch_parent = $query_parent->fetchRow();

		$level = $fetch_parent['level'];

		return $level+1;

	} else {

		return 0;

	}

}

// Function to work out root parent

function root_parent($page_id) {

	global $database;

	// Get page details

	$query_page = $database->query("SELECT parent,level FROM ".TABLE_PREFIX."pages WHERE page_id = '$page_id' LIMIT 1");

	$fetch_page = $query_page->fetchRow();

	$parent = $fetch_page['parent'];

	$level = $fetch_page['level'];	

	if($level == 1) {

		return $parent;

	} elseif($parent == 0) {

		return $page_id;

	} else {

		// Figure out what the root parents id is

		$parent_ids = array_reverse(get_parent_ids($page_id));

		return $parent_ids[0];

	}

}

// Function to get page title

function get_page_title($id) {

	global $database;

	// Get title

	$query = $database->query("SELECT page_title FROM ".TABLE_PREFIX."pages WHERE page_id = '$id'");

	$fetch = $query->fetchRow();

	// Return title

	return $fetch['page_title'];

}

// Function to get a pages menu title

function get_menu_title($id) {

	// Connect to the database

	$database = new database();

	// Get title

	$query = $database->query("SELECT menu_title FROM ".TABLE_PREFIX."pages WHERE page_id = '$id'");

	$fetch = $query->fetchRow();

	// Return title

	return $fetch['menu_title'];

}

// Function to get all parent page titles

function get_parent_titles($parent_id) {

	$titles[] = get_menu_title($parent_id);

	if(is_parent($parent_id) != false) {

		$parent_titles = get_parent_titles(is_parent($parent_id));

		$titles = array_merge($titles, $parent_titles);

	}

	return $titles;

}

// Function to get all parent page id's

function get_parent_ids($parent_id) {

	$ids[] = $parent_id;

	if(is_parent($parent_id) != false) {

		$parent_ids = get_parent_ids(is_parent($parent_id));

		$ids = array_merge($ids, $parent_ids);

	}

	return $ids;

}

// Function to genereate page trail

function get_page_trail($page_id) {

	return implode(',', array_reverse(get_parent_ids($page_id)));

}

// Function to get all sub pages id's

function get_subs($parent, $subs) {

	// Connect to the database

	$database = new database();

	// Get id's

	$query = $database->query("SELECT page_id FROM ".TABLE_PREFIX."pages WHERE parent = '$parent'");

	if($query->numRows() > 0) {

		while($fetch = $query->fetchRow()) {

			$subs[] = $fetch['page_id'];

			// Get subs of this sub

			$subs = get_subs($fetch['page_id'], $subs);

		}

	}

	// Return subs array

	return $subs;

}

// Function as replacement for php's htmlspecialchars()

// Will not mangle HTML-entities

function my_htmlspecialchars($string) {

	$string = preg_replace('/&(?=[#a-z0-9]+;)/i', '__amp;_', $string);

	$string = strtr($string, array('<'=>'&lt;', '>'=>'&gt;', '&'=>'&amp;', '"'=>'&quot;', '\''=>'&#39;'));

	$string = preg_replace('/__amp;_(?=[#a-z0-9]+;)/i', '&', $string);

	return($string);

}

// init utf8-functions -- workaround to prevent functions-utf8.php and charsets_table.php (~140kB) to be loaded more than once

// functions and arrays from functions-utf8.php and charsets_table.php will be in global name-space

function init_utf8funcs() {

	static $utf8_ok=0;

	if($utf8_ok == 0) {

		++$utf8_ok;

		require_once(WB_PATH.'/framework/functions-utf8.php');

	}

}

// Convert a string from mixed html-entities/umlauts to pure $charset_out-umlauts

// Will replace all numeric and named entities except > < ' " '  

// In case of error the returned string is unchanged, and a message is emitted.

function entities_to_umlauts($string, $charset_out=DEFAULT_CHARSET) {

	//init utf8-functions

	init_utf8funcs();

	return entities_to_umlauts2($string, $charset_out);

}

// Will convert a string in $charset_in encoding to a pure ASCII string with HTML-entities.

// In case of error the returned string is unchanged, and a message is emitted.

function umlauts_to_entities($string, $charset_in=DEFAULT_CHARSET) {

	//init utf8-functions

	init_utf8funcs();

	return umlauts_to_entities2($string, $charset_in);

}

// Function to convert a page title to a page filename

function page_filename($string) {

	//init utf8-functions

	init_utf8funcs();

	$string = entities_to_7bit($string);

	// Now replace spaces with page spcacer

	$string = trim($string);

	$string = preg_replace('/(\s)+/', PAGE_SPACER, $string);

	// Now remove all bad characters

	$bad = array(

	'\'', /* /  */ '"', /* " */	'<', /* < */	'>', /* > */

	'{', /* { */	'}', /* } */	'[', /* [ */	']', /* ] */	'`', /* ` */

	'!', /* ! */	'@', /* @ */	'#', /* # */	'$', /* $ */	'%', /* % */

	'^', /* ^ */	'&', /* & */	'*', /* * */	'(', /* ( */	')', /* ) */

	'=', /* = */	'+', /* + */	'|', /* | */	'/', /* / */	'\\', /* \ */

	';', /* ; */	':', /* : */	',', /* , */	'?' /* ? */

	);

	$string = str_replace($bad, '', $string);

	// Now convert to lower-case

	$string = strtolower($string);

	// If there are any weird language characters, this will protect us against possible problems they could cause

	$string = str_replace(array('%2F', '%'), array('/', ''), urlencode($string));

	// Finally, return the cleaned string

	return $string;

}

// Function to convert a desired media filename to a clean filename

function media_filename($string) {

	//init utf8-functions

	init_utf8funcs();

	$string = entities_to_7bit($string);

	// Now remove all bad characters

	$bad = array(

	'\'', // '

	'"', // "

	'`', // `

	'!', // !

	'@', // @

	'#', // #

	'$', // $

	'%', // %

	'^', // ^

	'&', // &

	'*', // *

	'=', // =

	'+', // +

	'|', // |

	'/', // /

	'\\', // \

	';', // ;

	':', // :

	',', // ,

	'?' // ?

	);

	$string = str_replace($bad, '', $string);

	// Clean any page spacers at the end of string

	$string = trim($string);

	// Finally, return the cleaned string

	return $string;

}

// Function to work out a page link

if(!function_exists('page_link')) {

	function page_link($link) {

		global $admin;

		return $admin->page_link($link);

	}

}

// Create a new file in the pages directory

function create_access_file($filename,$page_id,$level) {

	global $admin, $MESSAGE;

	if(!is_writable(WB_PATH.PAGES_DIRECTORY.'/')) {

		$admin->print_error($MESSAGE['PAGES']['CANNOT_CREATE_ACCESS_FILE']);

	} else {

		// First make sure parent folder exists

		$parent_folders = explode('/',str_replace(WB_PATH.PAGES_DIRECTORY, '', dirname($filename)));

		$parents = '';

		foreach($parent_folders AS $parent_folder) {

			if($parent_folder != '/' AND $parent_folder != '') {

				$parents .= '/'.$parent_folder;

				if(!file_exists(WB_PATH.PAGES_DIRECTORY.$parents)) {

					make_dir(WB_PATH.PAGES_DIRECTORY.$parents);

				}

			}	

		}

		// The depth of the page directory in the directory hierarchy

		// '/pages' is at depth 1

		$pages_dir_depth=count(explode('/',PAGES_DIRECTORY))-1;

		// Work-out how many ../'s we need to get to the index page

		$index_location = '';

		for($i = 0; $i < $level + $pages_dir_depth; $i++) {

			$index_location .= '../';

		}

		$content = ''.

'<?php

$page_id = '.$page_id.';

require("'.$index_location.'config.php");

require(WB_PATH."/index.php");

?>';

		$handle = fopen($filename, 'w');

		fwrite($handle, $content);

		fclose($handle);

		// Chmod the file

		change_mode($filename);

	}

}

// Function for working out a file mime type (if the in-built PHP one is not enabled)

if(!function_exists('mime_content_type')) {

   function mime_content_type($file) {

       $file = escapeshellarg($file);

       return trim(`file -bi $file`);

   }

}

// Generate a thumbnail from an image

function make_thumb($source, $destination, $size) {

	// Check if GD is installed

	if(extension_loaded('gd') AND function_exists('imageCreateFromJpeg')) {

		// First figure out the size of the thumbnail

		list($original_x, $original_y) = getimagesize($source);

		if ($original_x > $original_y) {

			$thumb_w = $size;

			$thumb_h = $original_y*($size/$original_x);

		}

		if ($original_x < $original_y) {

			$thumb_w = $original_x*($size/$original_y);

			$thumb_h = $size;

		}

		if ($original_x == $original_y) {

			$thumb_w = $size;

			$thumb_h = $size;	

		}

		// Now make the thumbnail

		$source = imageCreateFromJpeg($source);

		$dst_img = ImageCreateTrueColor($thumb_w, $thumb_h);

		imagecopyresampled($dst_img,$source,0,0,0,0,$thumb_w,$thumb_h,$original_x,$original_y);

		imagejpeg($dst_img, $destination);

		// Clear memory

		imagedestroy($dst_img);

	   imagedestroy($source);

	   // Return true

	   return true;

   } else {

   	return false;

   }

}

// Function to work-out a single part of an octal permission value

function extract_permission($octal_value, $who, $action) {

	// Make sure the octal value is 4 chars long

	if(strlen($octal_value) == 0) {

		$octal_value = '0000';

	} elseif(strlen($octal_value) == 1) {

		$octal_value = '000'.$octal_value;

	} elseif(strlen($octal_value) == 2) {

		$octal_value = '00'.$octal_value;

	} elseif(strlen($octal_value) == 3) {

		$octal_value = '0'.$octal_value;

	} elseif(strlen($octal_value) == 4) {

		$octal_value = ''.$octal_value;

	} else {

		$octal_value = '0000';

	}

	// Work-out what position of the octal value to look at

	switch($who) {

	case 'u':

		$position = '1';

		break;

	case 'user':

		$position = '1';

		break;

	case 'g':

		$position = '2';

		break;

	case 'group':

		$position = '2';

		break;

	case 'o':

		$position = '3';

		break;

	case 'others':

		$position = '3';

		break;

	}

	// Work-out how long the octal value is and ajust acording

	if(strlen($octal_value) == 4) {

		$position = $position+1;

	} elseif(strlen($octal_value) != 3) {

		exit('Error');

	}

	// Now work-out what action the script is trying to look-up

	switch($action) {

	case 'r':

		$action = 'r';

		break;

	case 'read':

		$action = 'r';

		break;

	case 'w':

		$action = 'w';

		break;

	case 'write':

		$action = 'w';

		break;

	case 'e':

		$action = 'e';

		break;

	case 'execute':

		$action = 'e';

		break;

	}

	// Get the value for "who"

	$value = substr($octal_value, $position-1, 1);

	// Now work-out the details of the value

	switch($value) {

	case '0':

		$r = false;

		$w = false;

		$e = false;

		break;

	case '1':

		$r = false;

		$w = false;

		$e = true;

		break;

	case '2':

		$r = false;

		$w = true;

		$e = false;

		break;

	case '3':

		$r = false;

		$w = true;

		$e = true;

		break;

	case '4':

		$r = true;

		$w = false;

		$e = false;

		break;

	case '5':

		$r = true;

		$w = false;

		$e = true;

		break;

	case '6':

		$r = true;

		$w = true;

		$e = false;

		break;

	case '7':

		$r = true;

		$w = true;

		$e = true;

		break;

	default:

		$r = false;

		$w = false;

		$e = false;

	}

	// And finally, return either true or false

	return $$action;

}

// Function to delete a page

function delete_page($page_id) {

	global $admin, $database, $MESSAGE;

	// Find out more about the page

	$database = new database();

	$query = "SELECT page_id,menu_title,page_title,level,link,parent,modified_by,modified_when FROM ".TABLE_PREFIX."pages WHERE page_id = '$page_id'";

	$results = $database->query($query);

	if($database->is_error()) {

		$admin->print_error($database->get_error());

	}

	if($results->numRows() == 0) {

		$admin->print_error($MESSAGE['PAGES']['NOT_FOUND']);

	}

	$results_array = $results->fetchRow();

	$parent = $results_array['parent'];

	$level = $results_array['level'];

	$link = $results_array['link'];

	$page_title = ($results_array['page_title']);

	$menu_title = ($results_array['menu_title']);

	// Get the sections that belong to the page

	$query_sections = $database->query("SELECT section_id,module FROM ".TABLE_PREFIX."sections WHERE page_id = '$page_id'");

	if($query_sections->numRows() > 0) {

		while($section = $query_sections->fetchRow()) {

			// Set section id

			$section_id = $section['section_id'];

			// Include the modules delete file if it exists

			if(file_exists(WB_PATH.'/modules/'.$section['module'].'/delete.php')) {

				require(WB_PATH.'/modules/'.$section['module'].'/delete.php');

			}

		}

	}

	// Update the pages table

	$query = "DELETE FROM ".TABLE_PREFIX."pages WHERE page_id = '$page_id'";

	$database->query($query);

	if($database->is_error()) {

		$admin->print_error($database->get_error());

	}

	// Update the sections table

	$query = "DELETE FROM ".TABLE_PREFIX."sections WHERE page_id = '$page_id'";

	$database->query($query);

	if($database->is_error()) {

		$admin->print_error($database->get_error());

	}

	// Include the ordering class or clean-up ordering

	require_once(WB_PATH.'/framework/class.order.php');

	$order = new order(TABLE_PREFIX.'pages', 'position', 'page_id', 'parent');

	$order->clean($parent);

	// Unlink the page access file and directory

	$directory = WB_PATH.PAGES_DIRECTORY.$link;

	$filename = $directory.PAGE_EXTENSION;

	$directory .= '/';

	if(file_exists($filename)) {

		if(!is_writable(WB_PATH.PAGES_DIRECTORY.'/')) {

			$admin->print_error($MESSAGE['PAGES']['CANNOT_DELETE_ACCESS_FILE']);

		} else {

			unlink($filename);

			if(file_exists($directory) && rtrim($directory,'/')!=WB_PATH.PAGES_DIRECTORY && substr($link, 0, 1) != '.') {

				rm_full_dir($directory);

			}

		}

	}

}

// Load module into DB

function load_module($directory, $install = false) {

	global $database,$admin,$MESSAGE;

	if(file_exists($directory.'/info.php')) {

		require($directory.'/info.php');

		if(isset($module_name)) {

			if(!isset($module_license)) { $module_license = 'GNU General Public License'; }

			if(!isset($module_platform) AND isset($module_designed_for)) { $module_platform = $module_designed_for; }

			if(!isset($module_function) AND isset($module_type)) { $module_function = $module_type; }

			$module_function = strtolower($module_function);

			// Check that it doesn't already exist

			$result = $database->query("SELECT addon_id FROM ".TABLE_PREFIX."addons WHERE directory = '".$module_directory."' LIMIT 0,1");

			if($result->numRows() == 0) {

				// Load into DB

				$query = "INSERT INTO ".TABLE_PREFIX."addons ".

				"(directory,name,description,type,function,version,platform,author,license) ".

				"VALUES ('$module_directory','$module_name','".addslashes($module_description)."','module',".

				"'$module_function','$module_version','$module_platform','$module_author','$module_license')";

				$database->query($query);

				// Run installation script

				if($install == true) {

					if(file_exists($directory.'/install.php')) {

						require($directory.'/install.php');

					}

				}

			}

		}

	}

}

// Load template into DB

function load_template($directory) {

	global $database;

	if(file_exists($directory.'/info.php')) {

		require($directory.'/info.php');

		if(isset($template_name)) {

			if(!isset($template_license)) { $template_license = 'GNU General Public License'; }

			if(!isset($template_platform) AND isset($template_designed_for)) { $template_platform = $template_designed_for; }

			// Check that it doesn't already exist

			$result = $database->query("SELECT addon_id FROM ".TABLE_PREFIX."addons WHERE directory = '".$template_directory."' LIMIT 0,1");

			if($result->numRows() == 0) {

				// Load into DB

				$query = "INSERT INTO ".TABLE_PREFIX."addons ".

				"(directory,name,description,type,version,platform,author,license) ".

				"VALUES ('$template_directory','$template_name','".addslashes($template_description)."','template',".

				"'$template_version','$template_platform','$template_author','$template_license')";

				$database->query($query);

			}

		}

	}

}

// Load language into DB

function load_language($file) {

	global $database;

	if(file_exists($file)) {

		require($file);

		if(isset($language_name)) {

			if(!isset($language_license)) { $language_license = 'GNU General Public License'; }

			if(!isset($language_platform) AND isset($language_designed_for)) { $language_platform = $language_designed_for; }

			// Check that it doesn't already exist

			$result = $database->query("SELECT addon_id FROM ".TABLE_PREFIX."addons WHERE directory = '".$language_code."' LIMIT 0,1");

			if($result->numRows() == 0) {

				// Load into DB

				$query = "INSERT INTO ".TABLE_PREFIX."addons ".

				"(directory,name,type,version,platform,author,license) ".

				"VALUES ('$language_code','$language_name','language',".

				"'$language_version','$language_platform','$language_author','$language_license')";

	 		$database->query($query);

			}

		}

	}

}

// Upgrade module info in DB, optionally start upgrade script

function upgrade_module($directory, $upgrade = false) {

	global $database, $admin, $MESSAGE;

	$directory = WB_PATH . "/modules/$directory";

	if(file_exists($directory.'/info.php')) {

		require($directory.'/info.php');

		if(isset($module_name)) {

			if(!isset($module_license)) { $module_license = 'GNU General Public License'; }

			if(!isset($module_platform) AND isset($module_designed_for)) { $module_platform = $module_designed_for; }

			if(!isset($module_function) AND isset($module_type)) { $module_function = $module_type; }

			$module_function = strtolower($module_function);

			// Check that it does already exist

			$result = $database->query("SELECT addon_id FROM ".TABLE_PREFIX."addons WHERE directory = '".$module_directory."' LIMIT 0,1");

			if($result->numRows() > 0) {

				// Update in DB

				$query = "UPDATE " . TABLE_PREFIX . "addons SET " .

					"version = '$module_version', " .

					"description = '" . addslashes($module_description) . "', " .

					"platform = '$module_platform', " .

					"author = '$module_author', " .

					"license = '$module_license'" .

					"WHERE directory = '$module_directory'";

				$database->query($query);

				// Run upgrade script

				if($upgrade == true) {

					if(file_exists($directory.'/upgrade.php')) {

						require($directory.'/upgrade.php');

					}

				}

			}

		}

	}

}

// extracts the content of a string variable from a string (save alternative to including files)

if(!function_exists('get_variable_content')) {

	function get_variable_content($search, $data, $striptags=true, $convert_to_entities=true) {

		$match = '';

		// search for $variable followed by 0-n whitespace then by = then by 0-n whitespace

		// then either " or ' then 0-n characters then either " or ' followed by 0-n whitespace and ;

		// the variable name is returned in $match[1], the content in $match[3]

		if (preg_match('/(\$' .$search .')\s*=\s*("|\')(.*)\2\s*;/', $data, $match)) {

			if(strip_tags(trim($match[1])) == '$' .$search) {

				// variable name matches, return it's value

				$match[3] = ($striptags == true) ? strip_tags($match[3]) : $match[3];

				$match[3] = ($convert_to_entities == true) ? htmlentities($match[3]) : $match[3];

				return $match[3];

			}

		}

		return false;