Several changes have been made in this commit, which together with the previous commits result in version 2.0 (database update required):v2.0

+ Implemented [core]: A new database field has been added to all tables to define optional "arguments" for a page, post or user through the content editor. These arguments will be parsed into key->value pairs and can be used within templates to do something special. Please read the wiki of this repository for further information about this new feature.
+ Bugfix [core]: The function "makeSlugURL" had not convert uppercase umlauts to lowercase because "strtolower" was used instead of the multibyte equivalent "mb_strtolower".
+ Optimization [core]: The first regular expression within the function "makeSlugURL" has been optimized (checking for uppercase characters at this point is unnecessary because $string is only lowercase).
+ Optimization [all templates]: Markup for the pagination.php has been simplified (a little bit).
+ Optimization [admin template]: The javascript for the arrow key navigation has been outsourced to the main.js file.
+ Optimization [admin template]: The javascript file will now be included with the "defer" attribute.
+ Optimization [standard template]: Some language variables have been changed.

Database update to version 2.0 (no existing data will be lost or changed):

ALTER TABLE `page` ADD `argv` VARCHAR(100) NULL DEFAULT NULL AFTER `body`;
ALTER TABLE `post` ADD `argv` VARCHAR(100) NULL DEFAULT NULL AFTER `body`;
ALTER TABLE `user` ADD `argv` VARCHAR(100) NULL DEFAULT NULL AFTER `body`;

1 files changed, 6 insertions, 2 deletions

diff --git a/core/functions.php b/core/functions.php
index c6bdb1e..2e36524 100644
--- a/core/functions.php
+++ b/core/functions.php
@@ -90,6 +90,7 @@ function generateItemData(Item $Item): array {
 		'ID'  => $Item->getID(),
 		'URL' => $Item->getURL(),
 		'GUID' => $Item->getGUID(),
+		'ARGV' => $Item->getArguments(),
 
 		'PREV' => FALSE,
 		'NEXT' => FALSE,
@@ -108,6 +109,7 @@ function generateItemData(Item $Item): array {
 			'SLUG' => $Item->attr('slug'),
 			'NAME' => $Item->attr('name'),
 			'BODY' => $Item->attr('body'),
+			'ARGV' => $Item->attr('argv'),
 			'TIME_INSERT' => $Item->attr('time_insert'),
 			'TIME_UPDATE' => $Item->attr('time_update')
 		]
@@ -136,6 +138,7 @@ function generateUserItemData(User\Item $User): array {
 		'ID'  => $User->getID(),
 		'URL' => $User->getURL(),
 		'GUID' => $User->getGUID(),
+		'ARGV' => $User->getArguments(),
 
 		'PREV' => FALSE,
 		'NEXT' => FALSE,
@@ -152,6 +155,7 @@ function generateUserItemData(User\Item $User): array {
 		'ATTR' => [
 			'SLUG' => $User->attr('slug'),
 			'BODY' => $User->attr('body'),
+			'ARGV' => $User->attr('argv'),
 			'USERNAME' => $User->attr('username'),
 			'FULLNAME' => $User->attr('fullname'),
 			'MAILADDR' => $User->attr('mailaddr'),
@@ -323,9 +327,9 @@ function description($string, $length = 200, $replace = ' […]') {
 # Generate a valid slug URL part from a string
 #===============================================================================
 function makeSlugURL($string) {
-	$string = strtolower($string);
+	$string = mb_strtolower($string);
 	$string = str_replace(['ä', 'ö', 'ü', 'ß'], ['ae', 'oe', 'ue', 'ss'], $string);
-	$string = preg_replace('/[^a-zA-Z0-9\-]/', '-', $string);
+	$string = preg_replace('/[^a-z0-9\-]/', '-', $string);
 	$string = preg_replace('/-+/', '-', $string);
 
 	return trim($string, '-');