functions.php

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			else
				return $url.'?'.$SID;
			
		} else {
			
			return $url;
			
		}
		
	}
	
	//
	// Fetch a language file
	//
	function fetch_language($language='', $section='') {
		
		$language = ( !empty($language) && in_array($language, $this->get_language_packs()) ) ? $language : $this->get_config('language');
		$section = ( !empty($section) ) ? $section : 'lang';
		
		if ( !array_key_exists($language, $this->language_sections) || !in_array($section, $this->language_sections[$language]) ) {
			
			if ( $section != 'lang' ) {
				
				$lang = $GLOBALS['lang'];
				if ( !file_exists(ROOT_PATH.'languages/'.$section.'_'.$language.'.php') ) {
					
					if ( $language != 'English' && in_array('English', $this->get_language_packs()) )
						require(ROOT_PATH.'languages/'.$section.'_English.php');
					else
						trigger_error('Section "'.$section.'" for language pack "'.$language.'" could not be found. No English fallback was available. Please use an updated language pack or also upload the English one.');
					
				} else {
					
					require(ROOT_PATH.'languages/'.$section.'_'.$language.'.php');
					
					if ( $language != 'English' && in_array('English', $this->get_language_packs()) )
						$lang = array_merge($this->fetch_language('English', $section), $lang);
					
				}
				
			} else {
				
				require(ROOT_PATH.'languages/'.$section.'_'.$language.'.php');
				
				if ( $language != 'English' && in_array('English', $this->get_language_packs()) )
					$lang = array_merge($this->fetch_language('English', $section), $lang);
				
				if ( empty($lang['character_encoding']) )
					$lang['character_encoding'] = 'iso-8859-1';
				
				if ( function_exists('mb_internal_encoding') )
					mb_internal_encoding($lang['character_encoding']);
				
			}
			
			$this->languages[$language] = $lang;
		}
		
		if ( !array_key_exists($language, $this->language_sections) )
			$this->language_sections[$language] = array();
		$this->language_sections[$language][] = $section;
		
		return $this->languages[$language];
		
	}
	
	//
	// Kick a user to the login form
	//
	function redir_to_login() {
		
		global $session, $template, $lang;
		
		if ( !$session->sess_info['user_id'] ) {
			
			$_SESSION['referer'] = $_SERVER['REQUEST_URI'];
			$this->redirect('panel.php', array('act' => 'login'));
			
		} else {
			
			header($_SERVER['SERVER_PROTOCOL'].' 403 Forbidden');
			$template->set_page_title($lang['Note']);
			$template->parse('msgbox', 'global', array(
				'box_title' => $lang['Note'],
				'content' => $lang['NotPermitted']
			));
			
		}
		
	}
	
	//
	// Generate a date given a timestamp
	//
	function make_date($stamp, $format='', $keep_gmt=false, $translate=true) {
		
		global $lang;
		
		$format = ( !empty($format) ) ? $format : $this->get_config('date_format');
		
		if ( $keep_gmt )
			$date = gmdate($format, $stamp);
		else
			$date = gmdate($format, $stamp + (3600 * $this->get_config('timezone')) + (3600 * $this->get_config('dst')));
		
		if ( $translate && array_key_exists('date_translations', $lang) && is_array($lang['date_translations']) )
			$date = ucfirst(strtr($date, $lang['date_translations']));
		
		return $date;
		
	}
	
	//
	// Generate a time past string
	//
	function time_past($timestamp, $until='') {
	
		global $lang;
	
		$seconds = ( ( is_int($until) ) ? $until : time() ) - $timestamp;
	
		$times = array();
		$sections = array(
			'weeks' => 604800,
			'days' => 86400,
			'hours' => 3600,
			'minutes' => 60,
			'seconds' => 1
		);
	
		foreach( $sections as $what => $length ) {
			
			if ( $seconds >= $length ) {
				
				$times[$what] = ( $length >0 ) ? floor($seconds / $length) : $length;
				$seconds %= $length;
				
			}
			
		}
	
		$sections = array();
		foreach ( $times as $key => $val )
			$sections[] = $val.' '.$lang[ucfirst($key)];
	
		return array($times, join(', ', $sections));
	
	}
	
	//
	// Generate an e-mail link
	//
	function show_email($user) {
		
		global $session, $lang;
		
		if ( $this->get_user_level() >= intval($this->get_config('view_hidden_email_addresses_min_level')) ) {
			
			//
			// The viewing user is an administrator
			//
			if ( $this->get_config('email_view_level') == 1 )
				return '<a href="'.$this->make_url('mail.php', array('id' => $user['id'])).'">'.$lang['SendMessage'].'</a>';
			elseif ( !$this->get_config('email_view_level') || $this->get_config('email_view_level') == 2 || $this->get_config('email_view_level') == 3 )
				return '<a href="mailto:'.$user['email'].'">'.$user['email'].'</a>';
			
		} else {
			
			//
			// The viewing user is not an administrator
			//
			if ( !$this->get_config('email_view_level') || !$user['email_show'] && $user['id'] != $session->sess_info['user_id'] )
				return $lang['Hidden'];
			elseif ( $this->get_config('email_view_level') == 1 )
				return '<a href="'.$this->make_url('mail.php', array('id' => $user['id'])).'">'.$lang['SendMessage'].'</a>';
			elseif ( $this->get_config('email_view_level') == 2 )
				return str_replace('@', ' at ', $user['email']);
			elseif ( $this->get_config('email_view_level') == 3 )
				return '<a href="mailto:'.$user['email'].'">'.$user['email'].'</a>';
			
		}
		
	}
	
	//
	// Generate a random key
	//
	function random_key() {
		
		$characters = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz1234567890';
		$length = 10;
		$key = '';
		
		for ( $i=0; $i<$length; $i++ ) {
			
			//
			// Make a seed for the random key generator
			// This is needed on PHP < 4.2.0
			//
			$seed = explode(' ', microtime());
			mt_srand($seed[0] * $seed[1]);
			$key .= $characters[mt_rand(0, strlen($characters)-1)];
			
		}
		
		return $key;
		
	}
	
	//
	// Send an email
	//
	function usebb_mail($subject, $rawbody, $bodyvars=array(), $from_name, $from_email, $to, $bcc_email='', $language='', $charset='') {
		
		global $lang;
		
		$bodyvars = ( is_array($bodyvars) ) ? $bodyvars : array();
		
		//
		// Eventually use the right language and character encoding which may be passed
		// in the parameters when another language is used (e.g. subscription notices)
		//
		$language = ( !empty($language) ) ? $language : $this->get_config('language');
		$charset = ( !empty($charset) ) ? $charset : $lang['character_encoding'];
		
		//
		// Set the correct mb_language when neccessary (only for Japanese, English or UTF-8)
		//
		if ( function_exists('mb_language') ) {
			
			if ( in_array($language, array('Japanese', 'ja', 'English', 'en')) )
				mb_language($language);
			elseif ( strtolower($charset) == 'utf-8' )
				mb_language('uni');
			else
				mb_language('en');
			
		}
		
		$body = str_replace(array("\r\n", "\r"), "\n", $rawbody);
		
		//
		// Windows: \r\n; other: \n
		//
		$cr = ( strstr(PHP_OS, 'WIN') !== false ) ? "\r\n" : "\n";
		$body = str_replace("\n", $cr, $rawbody);
		
		$bodyvars['board_name'] = $this->get_config('board_name');
		$bodyvars['board_link'] = $this->get_config('board_url');
		$bodyvars['admin_email'] = $this->get_config('admin_email');
		
		foreach ( $bodyvars as $key => $val )
			$body = str_replace('['.$key.']', $val, $body);
		
		$headers = array();
		
		if ( function_exists('mb_encode_mimeheader') ) {
			
			$from_name = mb_encode_mimeheader($from_name);
			$subject = mb_encode_mimeheader($subject);
			
		}
		
		$headers[] = 'MIME-Version: 1.0';
		if ( !empty($bcc_email) )
			$headers[] = 'Bcc: '.$bcc_email;
		$headers[] = 'Date: '.date('r');
		$headers[] = 'X-Mailer: UseBB/'.USEBB_VERSION;
		$headers[] = 'From: '.$from_name.' <'.$from_email.'>';
		
		if ( function_exists('mb_send_mail') ) {
			
			if ( !mb_send_mail($to, $subject, $body, join($cr, $headers)) )
				trigger_error('Unable to send e-mail!');
			
		} else {
			
			if ( strtolower($charset) == 'utf-8' )
				$headers[] = 'Content-Transfer-Encoding: 8bit';
			
			if ( !mail($to, $subject, $body, join($cr, $headers)) )
				trigger_error('Unable to send e-mail!');
			
		}
		
		if ( function_exists('mb_language') ) {
			
			mb_language($this->get_config('language'));
			mb_internal_encoding($lang['character_encoding']);
			
		}
		
	}
	
	//
	// Set the remember cookie
	//
	function set_al($user_id, $passwd_hash) {
		
		$content = array(
			intval($user_id),
			$passwd_hash
		);
		setcookie($this->get_config('session_name').'_al', serialize($content), time()[phone], $this->get_config('cookie_path'), $this->get_config('cookie_domain'), $this->get_config('cookie_secure'));
		
	}
	
	//
	// Unset the remember cookie
	//
	function unset_al() {
		
		setcookie($this->get_config('session_name').'_al', '', time()-31536000, $this->get_config('cookie_path'), $this->get_config('cookie_domain'), $this->get_config('cookie_secure'));
		
	}
	
	//
	// Is the remember cookie set?
	//
	function isset_al() {
		
		if ( !empty($_COOKIE[$this->get_config('session_name').'_al']) )
			return true;
		else
			return false;
		
	}
	
	//
	// Get the remember cookie's value
	//
	function get_al() {
		
		if ( $this->isset_al() ) {
			
			$content = stripslashes($_COOKIE[$this->get_config('session_name').'_al']);
			if ( substr($content, 0, 1) == 'a' )
				return unserialize($content);
			else
				return explode(':', $content, 2);
			
		} else {
			
			return false;
			
		}
		
	}
	
	//
	// Get the user's level
	//
	function get_user_level() {
		
		global $session;
		
		if ( !isset($session->sess_info['user_id']) )
			trigger_error('You first need to call $session->update() before you can get any session info.');
		
		if ( $session->sess_info['user_id'] )
			return $session->sess_info['user_info']['level'];
		else
			return LEVEL_GUEST;
		
	}
	
	//
	// Authorization function
	// Defines whether a user has permission to take a certain action.
	//
	function auth($auth_int, $action, $forum_id, $self=true, $alternative_user_info=null) {
		
		global $session, $db;
		
		if ( $self )
			$user_info = ( $session->sess_info['user_id'] ) ? $session->sess_info['user_info'] : array('id' => LEVEL_GUEST, 'level' => LEVEL_GUEST);
		else
			$user_info = $alternative_user_info;
		
		if ( ( $self && $session->sess_info['ip_banned'] ) || ( $this->get_config('board_closed') && $user_info['level'] < LEVEL_ADMIN ) )
			return false;
		
		//
		// Define the user level
		//
		if ( $user_info['id'] ) {
			
			if ( $user_info['level'] == LEVEL_MOD ) {
				
				if ( !is_array($this->mod_auth) ) {
					
					$result = $db->query("SELECT forum_id FROM ".TABLE_PREFIX."moderators WHERE user_id = ".$user_info['id']);
					$this->mod_auth = array();
					while ( $out = $db->fetch_result($result) )
						$this->mod_auth[] = intval($out['forum_id']);
					
				}
				
				if ( in_array($forum_id, $this->mod_auth) )
					$userlevel = LEVEL_MOD;
				else
					$userlevel = LEVEL_MEMBER;
				
			} else {
				
				$userlevel = $user_info['level'];
				
			}
			
		} else {
			
			if ( !$this->get_config('guests_can_access_board') )
				return false;
			else
				$userlevel = LEVEL_GUEST;
			
		}
		
		//
		// Get the part of the auth integer that
		// corresponds with the action given
		//
		$actions = array(
			'view' => 0,
			'read' => 1,
			'post' => 2,
			'reply' => 3,
			'edit' => 4,
			'move' => 5,
			'delete' => 6,
			'lock' => 7,
			'sticky' => 8,
			'html' => 9