Several changes have been made in this commit, which together with the previous commits result in version 2.2 [changed template parameters]:v2.2

+ Implemented [core]: A new method called "getAll" has been added to the "Attribute" class which now returns all attributes as key->value array. The first parameter can be an array with attribute names which shall be excluded from returning.

+ Optimization [core]: The function "generateItemData" has been renamed to "generateItemTemplateData" and has been restructured to use the new implemented method "getAll" from the "Attribute" class.

+ Optimization [core]: The function "generateNaviTemplate" has been added and the functions "generatePageNaviTemplate", "generatePostNaviTemplate" and "generateUserNaviTemplate" have been restructured to make use of the new "generateNaviTemplate" function to reduce duplicate code.

+ Optimization [core]: Several files within the admin directory has been optimized to use the new "getAll" method of the "Attribute" class.

+ Optimization [core]: Several code optimizations have been made to the "HTTP" class.

+ Optimization [admin template]: All occurences of $PAGE['ID'], $POST['ID'] and $USER['ID'] have been replaced with $PAGE['ATTR']['ID'], $POST['ATTR']['ID'] and $USER['ATTR']['ID'] to make it more consistent. You now have to use ['ATTR']['ID'] instead of ['ID'] in your templates to get the ID of an item!

Template upgrade to version 2.2 (only for customized templates):

SEARCH:  ['ID']
REPLACE: ['ATTR']['ID']

19 files changed, 102 insertions, 251 deletions

diff --git a/admin/page/delete.php b/admin/page/delete.php
index de9ac21..890188e 100644
--- a/admin/page/delete.php
+++ b/admin/page/delete.php
@@ -36,12 +36,7 @@ try {
 		$FormTemplate->set('FORM', [
 			'TYPE' => 'DELETE',
 			'INFO' => $messages ?? [],
-			'DATA' => [
-				'ID'   => $Attribute->get('id'),
-				'BODY' => $Attribute->get('body'),
-				'TIME_INSERT' => $Attribute->get('time_insert'),
-				'TIME_UPDATE' => $Attribute->get('time_update'),
-			],
+			'DATA' => array_change_key_case($Attribute->getAll(), CASE_UPPER),
 			'TOKEN' => Application::getSecurityToken()
 		]);
 
diff --git a/admin/page/insert.php b/admin/page/insert.php
index 5731b6f..a360c1b 100644
--- a/admin/page/insert.php
+++ b/admin/page/insert.php
@@ -56,16 +56,7 @@ try {
 	$FormTemplate->set('FORM', [
 		'TYPE' => 'INSERT',
 		'INFO' => $messages ?? [],
-		'DATA' => [
-			'ID'   => $Attribute->get('id'),
-			'USER' => $Attribute->get('user'),
-			'SLUG' => $Attribute->get('slug'),
-			'NAME' => $Attribute->get('name'),
-			'BODY' => $Attribute->get('body'),
-			'ARGV' => $Attribute->get('argv'),
-			'TIME_INSERT' => $Attribute->get('time_insert'),
-			'TIME_UPDATE' => $Attribute->get('time_update'),
-		],
+		'DATA' => array_change_key_case($Attribute->getAll(), CASE_UPPER),
 		'USER_LIST' => $userAttributes ??  [],
 		'TOKEN' => Application::getSecurityToken()
 	]);
diff --git a/admin/page/update.php b/admin/page/update.php
index dc92073..18c9785 100644
--- a/admin/page/update.php
+++ b/admin/page/update.php
@@ -58,16 +58,7 @@ try {
 		$FormTemplate->set('FORM', [
 			'TYPE' => 'UPDATE',
 			'INFO' => $messages ?? [],
-			'DATA' => [
-				'ID'   => $Attribute->get('id'),
-				'USER' => $Attribute->get('user'),
-				'SLUG' => $Attribute->get('slug'),
-				'NAME' => $Attribute->get('name'),
-				'BODY' => $Attribute->get('body'),
-				'ARGV' => $Attribute->get('argv'),
-				'TIME_INSERT' => $Attribute->get('time_insert'),
-				'TIME_UPDATE' => $Attribute->get('time_update'),
-			],
+			'DATA' => array_change_key_case($Attribute->getAll(), CASE_UPPER),
 			'USER_LIST' => $userAttributes ??  [],
 			'TOKEN' => Application::getSecurityToken()
 		]);
diff --git a/admin/post/delete.php b/admin/post/delete.php
index a5151ff..80f3a70 100644
--- a/admin/post/delete.php
+++ b/admin/post/delete.php
@@ -36,12 +36,7 @@ try {
 		$FormTemplate->set('FORM', [
 			'TYPE' => 'DELETE',
 			'INFO' => $messages ?? [],
-			'DATA' => [
-				'ID'   => $Attribute->get('id'),
-				'BODY' => $Attribute->get('body'),
-				'TIME_INSERT' => $Attribute->get('time_insert'),
-				'TIME_UPDATE' => $Attribute->get('time_update'),
-			],
+			'DATA' => array_change_key_case($Attribute->getAll(), CASE_UPPER),
 			'TOKEN' => Application::getSecurityToken()
 		]);
 
diff --git a/admin/post/insert.php b/admin/post/insert.php
index 4587a87..8e08fb3 100644
--- a/admin/post/insert.php
+++ b/admin/post/insert.php
@@ -56,16 +56,7 @@ try {
 	$FormTemplate->set('FORM', [
 		'TYPE' => 'INSERT',
 		'INFO' => $messages ?? [],
-		'DATA' => [
-			'ID'   => $Attribute->get('id'),
-			'USER' => $Attribute->get('user'),
-			'SLUG' => $Attribute->get('slug'),
-			'NAME' => $Attribute->get('name'),
-			'BODY' => $Attribute->get('body'),
-			'ARGV' => $Attribute->get('argv'),
-			'TIME_INSERT' => $Attribute->get('time_insert'),
-			'TIME_UPDATE' => $Attribute->get('time_update'),
-		],
+		'DATA' => array_change_key_case($Attribute->getAll(), CASE_UPPER),
 		'USER_LIST' => $userAttributes ??  [],
 		'TOKEN' => Application::getSecurityToken()
 	]);
diff --git a/admin/post/update.php b/admin/post/update.php
index 7e3610f..af26835 100644
--- a/admin/post/update.php
+++ b/admin/post/update.php
@@ -58,16 +58,7 @@ try {
 		$FormTemplate->set('FORM', [
 			'TYPE' => 'UPDATE',
 			'INFO' => $messages ?? [],
-			'DATA' => [
-				'ID'   => $Attribute->get('id'),
-				'USER' => $Attribute->get('user'),
-				'SLUG' => $Attribute->get('slug'),
-				'NAME' => $Attribute->get('name'),
-				'BODY' => $Attribute->get('body'),
-				'ARGV' => $Attribute->get('argv'),
-				'TIME_INSERT' => $Attribute->get('time_insert'),
-				'TIME_UPDATE' => $Attribute->get('time_update'),
-			],
+			'DATA' => array_change_key_case($Attribute->getAll(), CASE_UPPER),
 			'USER_LIST' => $userAttributes ??  [],
 			'TOKEN' => Application::getSecurityToken()
 		]);
diff --git a/admin/user/delete.php b/admin/user/delete.php
index 7023246..28d1b2a 100644
--- a/admin/user/delete.php
+++ b/admin/user/delete.php
@@ -36,12 +36,7 @@ try {
 		$FormTemplate->set('FORM', [
 			'TYPE' => 'DELETE',
 			'INFO' => $messages ?? [],
-			'DATA' => [
-				'ID'   => $Attribute->get('id'),
-				'BODY' => $Attribute->get('body'),
-				'TIME_INSERT' => $Attribute->get('time_insert'),
-				'TIME_UPDATE' => $Attribute->get('time_update'),
-			],
+			'DATA' => array_change_key_case($Attribute->getAll(['password']), CASE_UPPER),
 			'TOKEN' => Application::getSecurityToken()
 		]);
 
diff --git a/admin/user/insert.php b/admin/user/insert.php
index 81daf98..2d49322 100644
--- a/admin/user/insert.php
+++ b/admin/user/insert.php
@@ -47,18 +47,7 @@ try {
 	$FormTemplate->set('FORM', [
 		'TYPE' => 'INSERT',
 		'INFO' => $messages ?? [],
-		'DATA' => [
-			'ID'       => $Attribute->get('id'),
-			'SLUG'     => $Attribute->get('slug'),
-			'USERNAME' => $Attribute->get('username'),
-			'PASSWORD' => NULL,
-			'FULLNAME' => $Attribute->get('fullname'),
-			'MAILADDR' => $Attribute->get('mailaddr'),
-			'BODY'     => $Attribute->get('body'),
-			'ARGV'     => $Attribute->get('argv'),
-			'TIME_INSERT' => $Attribute->get('time_insert'),
-			'TIME_UPDATE' => $Attribute->get('time_update'),
-		],
+		'DATA' => array_change_key_case($Attribute->getAll(['password']), CASE_UPPER),
 		'TOKEN' => Application::getSecurityToken()
 	]);
 
diff --git a/admin/user/update.php b/admin/user/update.php
index cdacfa0..3ba6df8 100644
--- a/admin/user/update.php
+++ b/admin/user/update.php
@@ -50,18 +50,7 @@ try {
 		$FormTemplate->set('FORM', [
 			'TYPE' => 'UPDATE',
 			'INFO' => $messages ?? [],
-			'DATA' => [
-				'ID'       => $Attribute->get('id'),
-				'SLUG'     => $Attribute->get('slug'),
-				'USERNAME' => $Attribute->get('username'),
-				'PASSWORD' => NULL,
-				'FULLNAME' => $Attribute->get('fullname'),
-				'MAILADDR' => $Attribute->get('mailaddr'),
-				'BODY'     => $Attribute->get('body'),
-				'ARGV'     => $Attribute->get('argv'),
-				'TIME_INSERT' => $Attribute->get('time_insert'),
-				'TIME_UPDATE' => $Attribute->get('time_update'),
-			],
+			'DATA' => array_change_key_case($Attribute->getAll(['password']), CASE_UPPER),
 			'TOKEN' => Application::getSecurityToken()
 		]);
 
diff --git a/core/functions.php b/core/functions.php
index ccaf008..35faed4 100644
--- a/core/functions.php
+++ b/core/functions.php
@@ -2,16 +2,18 @@
 #===============================================================================
 # Helper function to reduce duplicate code
 #===============================================================================
-function generatePageNaviTemplate($currentSite): Template\Template {
+function generateNaviTemplate(int $current, $location, $namespace): Template\Template {
 	$Database = Application::getDatabase();
-	$Statement = $Database->query(sprintf('SELECT COUNT(id) FROM %s', Page\Attribute::TABLE));
+	$Attribute = "{$namespace}\\Attribute";
 
-	$lastSite = ceil($Statement->fetchColumn() / Application::get('PAGE.LIST_SIZE'));
+	$Statement = $Database->query(sprintf('SELECT COUNT(id) FROM %s', $Attribute::TABLE));
+
+	$lastSite = ceil($Statement->fetchColumn() / Application::get(strtoupper($namespace).'.LIST_SIZE'));
 
 	$PaginationTemplate = Template\Factory::build('pagination');
-	$PaginationTemplate->set('THIS', $currentSite);
+	$PaginationTemplate->set('THIS', $current);
 	$PaginationTemplate->set('LAST', $lastSite);
-	$PaginationTemplate->set('HREF', Application::getPageURL('?site=%d'));
+	$PaginationTemplate->set('HREF', "{$location}?site=%d");
 
 	return $PaginationTemplate;
 }
@@ -19,35 +21,22 @@ function generatePageNaviTemplate($currentSite): Template\Template {
 #===============================================================================
 # Helper function to reduce duplicate code
 #===============================================================================
-function generatePostNaviTemplate($currentSite): Template\Template {
-	$Database = Application::getDatabase();
-	$Statement = $Database->query(sprintf('SELECT COUNT(id) FROM %s', Post\Attribute::TABLE));
-
-	$lastSite = ceil($Statement->fetchColumn() / Application::get('POST.LIST_SIZE'));
-
-	$PaginationTemplate = Template\Factory::build('pagination');
-	$PaginationTemplate->set('THIS', $currentSite);
-	$PaginationTemplate->set('LAST', $lastSite);
-	$PaginationTemplate->set('HREF', Application::getPostURL('?site=%d'));
-
-	return $PaginationTemplate;
+function generatePageNaviTemplate($current): Template\Template {
+	return generateNaviTemplate($current, Application::getPageURL(), 'Page');
 }
 
 #===============================================================================
 # Helper function to reduce duplicate code
 #===============================================================================
-function generateUserNaviTemplate($currentSite): Template\Template {
-	$Database = Application::getDatabase();
-	$Statement = $Database->query(sprintf('SELECT COUNT(id) FROM %s', User\Attribute::TABLE));
-
-	$lastSite = ceil($Statement->fetchColumn() / Application::get('USER.LIST_SIZE'));
-
-	$PaginationTemplate = Template\Factory::build('pagination');
-	$PaginationTemplate->set('THIS', $currentSite);
-	$PaginationTemplate->set('LAST', $lastSite);
-	$PaginationTemplate->set('HREF', Application::getUserURL('?site=%d'));
+function generatePostNaviTemplate($current): Template\Template {
+	return generateNaviTemplate($current, Application::getPostURL(), 'Post');
+}
 
-	return $PaginationTemplate;
+#===============================================================================
+# Helper function to reduce duplicate code
+#===============================================================================
+function generateUserNaviTemplate($current): Template\Template {
+	return generateNaviTemplate($current, Application::getUserURL(), 'User');
 }
 
 #===============================================================================
@@ -55,8 +44,8 @@ function generateUserNaviTemplate($currentSite): Template\Template {
 #===============================================================================
 function generatePageItemTemplate(Page\Item $Page, User\Item $User): Template\Template {
 	$Template = Template\Factory::build('page/item');
-	$Template->set('PAGE', generatePageItemData($Page));
-	$Template->set('USER', generateUserItemData($User));
+	$Template->set('PAGE', generateItemTemplateData($Page));
+	$Template->set('USER', generateItemTemplateData($User));
 
 	return $Template;
 }
@@ -66,8 +55,8 @@ function generatePageItemTemplate(Page\Item $Page, User\Item $User): Template\Te
 #===============================================================================
 function generatePostItemTemplate(Post\Item $Post, User\Item $User): Template\Template {
 	$Template = Template\Factory::build('post/item');
-	$Template->set('POST', generatePostItemData($Post));
-	$Template->set('USER', generateUserItemData($User));
+	$Template->set('POST', generateItemTemplateData($Post));
+	$Template->set('USER', generateItemTemplateData($User));
 
 	return $Template;
 }
@@ -77,7 +66,7 @@ function generatePostItemTemplate(Post\Item $Post, User\Item $User): Template\Te
 #===============================================================================
 function generateUserItemTemplate(User\Item $User): Template\Template {
 	$Template = Template\Factory::build('user/item');
-	$Template->set('USER', generateUserItemData($User));
+	$Template->set('USER', generateItemTemplateData($User));
 
 	return $Template;
 }
@@ -85,13 +74,17 @@ function generateUserItemTemplate(User\Item $User): Template\Template {
 #===============================================================================
 # Helper function to reduce duplicate code
 #===============================================================================
-function generateItemData(Item $Item): array {
+function generateItemTemplateData(Item $Item): array {
+	$ATTR = $Item->getAttribute()->getAll(['password']);
+	$ATTR = array_change_key_case($ATTR, CASE_UPPER);
+
 	return [
-		'ID'  => $Item->getID(),
 		'URL' => $Item->getURL(),
 		'GUID' => $Item->getGUID(),
 		'ARGV' => $Item->getArguments(),
 
+		'ATTR' => $ATTR,
+
 		'PREV' => FALSE,
 		'NEXT' => FALSE,
 
@@ -106,69 +99,6 @@ function generateItemData(Item $Item): array {
 			'HTML' => function() use($Item) {
 				return $Item->getHTML();
 			}
-		],
-
-		'ATTR' => [
-			'USER' => $Item->attr('user'),
-			'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')
-		]
-	];
-}
-
-#===============================================================================
-# Helper function to reduce duplicate code
-#===============================================================================
-function generatePageItemData(Page\Item $Page): array {
-	return generateItemData($Page);
-}
-
-#===============================================================================
-# Helper function to reduce duplicate code
-#===============================================================================
-function generatePostItemData(Post\Item $Post): array {
-	return generateItemData($Post);
-}
-
-#===============================================================================
-# Helper function to reduce duplicate code
-#===============================================================================
-function generateUserItemData(User\Item $User): array {
-	return [
-		'ID'  => $User->getID(),
-		'URL' => $User->getURL(),
-		'GUID' => $User->getGUID(),
-		'ARGV' => $User->getArguments(),
-
-		'PREV' => FALSE,
-		'NEXT' => FALSE,
-
-		'FILE' => [
-			'LIST' => $User->getFiles()
-		],
-
-		'BODY' => [
-			'TEXT' => function() use($User) {
-				return $User->getBody();
-			},
-			'HTML' => function() use($User) {
-				return $User->getHTML();
-			}
-		],
-
-		'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'),
-			'TIME_INSERT' => $User->attr('time_insert'),
-			'TIME_UPDATE' => $User->attr('time_update')
 		]
 	];
 }
@@ -354,7 +284,7 @@ function makeSlugURL($string, $separator = '-') {
 function PAGE(int $id): array {
 	try {
 		$Page = Page\Factory::build($id);
-		return generatePageItemData($Page);
+		return generateItemTemplateData($Page);
 	} catch(Page\Exception $Exception) {
 		return [];
 	}
@@ -366,7 +296,7 @@ function PAGE(int $id): array {
 function POST(int $id): array {
 	try {
 		$Post = Post\Factory::build($id);
-		return generatePostItemData($Post);
+		return generateItemTemplateData($Post);
 	} catch(Post\Exception $Exception) {
 		return [];
 	}
@@ -378,7 +308,7 @@ function POST(int $id): array {
 function USER(int $id): array {
 	try {
 		$User = User\Factory::build($id);
-		return generateUserItemData($User);
+		return generateItemTemplateData($User);
 	} catch(User\Exception $Exception) {
 		return [];
 	}
diff --git a/core/include/feed/main.php b/core/include/feed/main.php
index 671f5c7..8879e72 100644
--- a/core/include/feed/main.php
+++ b/core/include/feed/main.php
@@ -24,8 +24,8 @@ try {
 				$User = User\Factory::build($Post->attr('user'));
 
 				$ItemTemplate = Template\Factory::build('feed/item_post');
-				$ItemTemplate->set('POST', generatePostItemData($Post));
-				$ItemTemplate->set('USER', generateUserItemData($User));
+				$ItemTemplate->set('POST', generateItemTemplateData($Post));
+				$ItemTemplate->set('USER', generateItemTemplateData($User));
 
 				$posts[] = $ItemTemplate;
 			}
@@ -45,8 +45,8 @@ try {
 				$User = User\Factory::build($Page->attr('user'));
 
 				$ItemTemplate = Template\Factory::build('feed/item_page');
-				$ItemTemplate->set('PAGE', generatePageItemData($Page));
-				$ItemTemplate->set('USER', generateUserItemData($User));
+				$ItemTemplate->set('PAGE', generateItemTemplateData($Page));
+				$ItemTemplate->set('USER', generateItemTemplateData($User));
 
 				$pages[] = $ItemTemplate;
 			}
diff --git a/core/include/page/main.php b/core/include/page/main.php
index 01579fc..18ba4c8 100644
--- a/core/include/page/main.php
+++ b/core/include/page/main.php
@@ -19,20 +19,20 @@ try {
 
 	$User = User\Factory::build($Page->attr('user'));
 
-	$page_data = generatePageItemData($Page);
-	$user_data = generateUserItemData($User);
+	$page_data = generateItemTemplateData($Page);
+	$user_data = generateItemTemplateData($User);
 
 	#===============================================================================
 	# Add page data for previous and next page
 	#===============================================================================
 	try {
 		$PrevPage = Page\Factory::build($Page->getPrevID());
-		$page_data['PREV'] = generatePageItemData($PrevPage);
+		$page_data['PREV'] = generateItemTemplateData($PrevPage);
 	} catch(Page\Exception $Exception){}
 
 	try {
 		$NextPage = Page\Factory::build($Page->getNextID());
-		$page_data['NEXT'] = generatePageItemData($NextPage);
+		$page_data['NEXT'] = generateItemTemplateData($NextPage);
 	} catch(Page\Exception $Exception){}
 
 	#===============================================================================
diff --git a/core/include/post/main.php b/core/include/post/main.php
index 8cd0a49..f091a4c 100644
--- a/core/include/post/main.php
+++ b/core/include/post/main.php
@@ -19,20 +19,20 @@ try {
 
 	$User = User\Factory::build($Post->attr('user'));
 
-	$post_data = generatePostItemData($Post);
-	$user_data = generateUserItemData($User);
+	$post_data = generateItemTemplateData($Post);
+	$user_data = generateItemTemplateData($User);
 
 	#===============================================================================
 	# Add post data for previous and next post
 	#===============================================================================
 	try {
 		$PrevPost = Post\Factory::build($Post->getPrevID());
-		$post_data['PREV'] = generatePostItemData($PrevPost);
+		$post_data['PREV'] = generateItemTemplateData($PrevPost);
 	} catch(Post\Exception $Exception){}
 
 	try {
 		$NextPost = Post\Factory::build($Post->getNextID());
-		$post_data['NEXT'] = generatePostItemData($NextPost);
+		$post_data['NEXT'] = generateItemTemplateData($NextPost);
 	} catch(Post\Exception $Exception){}
 
 	#===============================================================================
diff --git a/core/include/user/main.php b/core/include/user/main.php
index ba0d07b..b2b054a 100644
--- a/core/include/user/main.php
+++ b/core/include/user/main.php
@@ -17,19 +17,19 @@ try {
 		$User = User\Factory::build($param);
 	}
 
-	$user_data = generateUserItemData($User);
+	$user_data = generateItemTemplateData($User);
 
 	#===============================================================================
 	# Add user data for previous and next user
 	#===============================================================================
 	try {
 		$PrevUser = User\Factory::build($User->getPrevID());
-		$user_data['PREV'] = generateUserItemData($PrevUser);
+		$user_data['PREV'] = generateItemTemplateData($PrevUser);
 	} catch(User\Exception $Exception){}
 
 	try {
 		$NextUser = User\Factory::build($User->getNextID());
-		$user_data['NEXT'] = generateUserItemData($NextUser);
+		$user_data['NEXT'] = generateItemTemplateData($NextUser);
 	} catch(User\Exception $Exception){}
 
 	#===============================================================================
diff --git a/core/namespace/Attribute.php b/core/namespace/Attribute.php
index 69998e0..32cfa0a 100644
--- a/core/namespace/Attribute.php
+++ b/core/namespace/Attribute.php
@@ -16,6 +16,17 @@ abstract class Attribute implements AttributeInterface {
 	}
 
 	#===============================================================================
+	# Get all attributes
+	#===============================================================================
+	public function getAll($exclude = []): array {
+		$attributes = get_object_vars($this);
+
+		return array_filter($attributes, function($attribute) use($exclude) {
+			return !in_array($attribute, $exclude);
+		}, ARRAY_FILTER_USE_KEY);
+	}
+
+	#===============================================================================
 	# Get array with not FALSE attributes
 	#===============================================================================
 	protected function getFilteredAttributes(): array {
diff --git a/core/namespace/HTTP.php b/core/namespace/HTTP.php
index bc2e062..d14b69b 100644
--- a/core/namespace/HTTP.php
+++ b/core/namespace/HTTP.php
@@ -81,23 +81,22 @@ class HTTP {
 		self::$POST = $POST;
 		self::$FILE = $FILE;
 
-		$removeArrays AND self::removeArrays();
+		if($removeArrays) {
+			self::$GET  = self::removeArrayValues(self::$GET);
+			self::$POST = self::removeArrayValues(self::$POST);
+		}
 
 		self::$GET  = ($trimValues === TRUE ? self::trim(self::$GET)  : self::$GET );
 		self::$POST = ($trimValues === TRUE ? self::trim(self::$POST) : self::$POST);
 	}
 
 	#===============================================================================
-	# Remove all arrays from $_GET and $_POST
+	# Remove all array values inside an array
 	#===============================================================================
-	private static function removeArrays() {
-		foreach(['GET', 'POST'] as $HTTP) {
-			foreach(self::$$HTTP as $name => $value) {
-				if(is_array(self::$$HTTP[$name])) {
-					unset(self::$$HTTP[$name]);
-				}
-			}
-		}
+	private static function removeArrayValues(array $array) {
+		return array_filter($array, function($value) {
+			return !is_array($value);
+		});
 	}
 
 	#===============================================================================
@@ -114,7 +113,7 @@ class HTTP {
 	#===============================================================================
 	# Checks if all elements of $arguments are set as key of $data
 	#===============================================================================
-	private static function issetData($data, $arguments) {
+	private static function issetData($data, $arguments): bool {
 		foreach($arguments as $key) {
 			if(is_array($key)) {
 				if(!isset($data[key($key)]) OR $data[key($key)] !== $key[key($key)]) {
@@ -131,61 +130,45 @@ class HTTP {
 	}
 
 	#===============================================================================
-	# Return null or the value (if set) from one of the three requests attributes
-	#===============================================================================
-	public static function returnKey($data, array $paths) {
-		$current = &$data;
-
-		foreach($paths as $path) {
-			if(!isset($current[$path])) {
-				return NULL;
-			}
-			$current = &$current[$path];
-		}
-
-		return $current;
-	}
-
-	#===============================================================================
 	# Return GET value
 	#===============================================================================
-	public static function GET() {
-		return self::returnKey(self::$GET, func_get_args());
+	public static function GET($parameter) {
+		return self::$GET[$parameter] ?? NULL;
 	}
 
 	#===============================================================================
 	# Return POST value
 	#===============================================================================
-	public static function POST() {
-		return self::returnKey(self::$POST, func_get_args());
+	public static function POST($parameter) {
+		return self::$POST[$parameter] ?? NULL;
 	}
 
 	#===============================================================================
 	# Return FILE value
 	#===============================================================================
-	public static function FILE() {
-		return self::returnKey(self::$FILE, func_get_args());
+	public static function FILE($parameter) {
+		return self::$FILE[$parameter] ?? NULL;
 	}
 
 	#===============================================================================
-	# Checks if all elements of func_get_args() are set key of self::$POST
+	# Checks if all elements of $parameters are set as key in self::$GET
 	#===============================================================================
-	public static function issetPOST() {
-		return self::issetData(self::$POST, func_get_args());
+	public static function issetGET(... $parameters): bool {
+		return self::issetData(self::$GET, $parameters);
 	}
 
 	#===============================================================================
-	# Checks if all elements of func_get_args() are set key of self::$GET
+	# Checks if all elements of $parameters are set as key in self::$POST
 	#===============================================================================
-	public static function issetGET() {
-		return self::issetData(self::$GET, func_get_args());
+	public static function issetPOST(... $parameters): bool {
+		return self::issetData(self::$POST, $parameters);
 	}
 
 	#===============================================================================
-	# Checks if all elements of func_get_args() are set key of self::$FILE
+	# Checks if all elements of $parameters are set as key in self::$FILE
 	#===============================================================================
-	public static function issetFILE() {
-		return self::issetData(self::$FILE, func_get_args());
+	public static function issetFILE(... $parameters): bool {
+		return self::issetData(self::$FILE, $parameters);
 	}
 
 	#===============================================================================
diff --git a/template/admin/html/page/item.php b/template/admin/html/page/item.php
index 599e942..8afeb15 100644
--- a/template/admin/html/page/item.php
+++ b/template/admin/html/page/item.php
@@ -1,8 +1,8 @@
 <li class="item-list-li page">
 	<header>
-		<h2><i class="fa fa-file-text-o"></i><?=escapeHTML($PAGE['ATTR']['NAME'])?><span>#<?=$PAGE['ID']?></span></h2>
+		<h2><i class="fa fa-file-text-o"></i><?=escapeHTML($PAGE['ATTR']['NAME'])?><span>#<?=$PAGE['ATTR']['ID']?></span></h2>
 		<div>
-			<a class="brackets" href="<?=Application::getAdminURL("user/update.php?id={$USER['ID']}")?>"><?=escapeHTML($USER['ATTR']['FULLNAME'])?></a>
+			<a class="brackets" href="<?=Application::getAdminURL("user/update.php?id={$USER['ATTR']['ID']}")?>"><?=escapeHTML($USER['ATTR']['FULLNAME'])?></a>
 			<time class="brackets" datetime="<?=$PAGE['ATTR']['TIME_INSERT']?>"><?=parseDatetime($PAGE['ATTR']['TIME_INSERT'], $Language->template('date_format'))?></time>
 		</div>
 	</header>
@@ -21,8 +21,8 @@
 	<footer>
 		<ul>
 			<li><a href="<?=$PAGE['URL']?>" target="_blank" title="<?=$Language->text('select_page')?>"><i class="fa fa-external-link"></i></a></li>
-			<li><a href="<?=Application::getAdminURL("page/update.php?id={$PAGE['ID']}")?>" title="<?=$Language->text('update_page')?>"><i class="fa fa-pencil-square-o"></i></a></li>
-			<li><a href="<?=Application::getAdminURL("page/delete.php?id={$PAGE['ID']}")?>" title="<?=$Language->text('delete_page')?>"><i class="fa fa-trash-o"></i></a></li>
+			<li><a href="<?=Application::getAdminURL("page/update.php?id={$PAGE['ATTR']['ID']}")?>" title="<?=$Language->text('update_page')?>"><i class="fa fa-pencil-square-o"></i></a></li>
+			<li><a href="<?=Application::getAdminURL("page/delete.php?id={$PAGE['ATTR']['ID']}")?>" title="<?=$Language->text('delete_page')?>"><i class="fa fa-trash-o"></i></a></li>
 		</ul>
 	</footer>
 </li>
\ No newline at end of file
diff --git a/template/admin/html/post/item.php b/template/admin/html/post/item.php
index abc2b0f..a49e2a5 100644
--- a/template/admin/html/post/item.php
+++ b/template/admin/html/post/item.php
@@ -1,8 +1,8 @@
 <li class="item-list-li post">
 	<header>
-		<h2><i class="fa fa-newspaper-o"></i><?=escapeHTML($POST['ATTR']['NAME'])?><span>#<?=$POST['ID']?></span></h2>
+		<h2><i class="fa fa-newspaper-o"></i><?=escapeHTML($POST['ATTR']['NAME'])?><span>#<?=$POST['ATTR']['ID']?></span></h2>
 		<div>
-			<a class="brackets" href="<?=Application::getAdminURL("user/update.php?id={$USER['ID']}")?>"><?=escapeHTML($USER['ATTR']['FULLNAME'])?></a>
+			<a class="brackets" href="<?=Application::getAdminURL("user/update.php?id={$USER['ATTR']['ID']}")?>"><?=escapeHTML($USER['ATTR']['FULLNAME'])?></a>
 			<time class="brackets" datetime="<?=$POST['ATTR']['TIME_INSERT']?>"><?=parseDatetime($POST['ATTR']['TIME_INSERT'], $Language->template('date_format'))?></time>
 		</div>
 	</header>
@@ -21,8 +21,8 @@
 	<footer>
 		<ul>
 			<li><a href="<?=$POST['URL']?>" target="_blank" title="<?=$Language->text('select_post')?>"><i class="fa fa-external-link"></i></a></li>
-			<li><a href="<?=Application::getAdminURL("post/update.php?id={$POST['ID']}")?>" title="<?=$Language->text('update_post')?>"><i class="fa fa-pencil-square-o"></i></a></li>
-			<li><a href="<?=Application::getAdminURL("post/delete.php?id={$POST['ID']}")?>" title="<?=$Language->text('delete_post')?>"><i class="fa fa-trash-o"></i></a></li>
+			<li><a href="<?=Application::getAdminURL("post/update.php?id={$POST['ATTR']['ID']}")?>" title="<?=$Language->text('update_post')?>"><i class="fa fa-pencil-square-o"></i></a></li>
+			<li><a href="<?=Application::getAdminURL("post/delete.php?id={$POST['ATTR']['ID']}")?>" title="<?=$Language->text('delete_post')?>"><i class="fa fa-trash-o"></i></a></li>
 		</ul>
 	</footer>
 </li>
\ No newline at end of file
diff --git a/template/admin/html/user/item.php b/template/admin/html/user/item.php
index 731f6b5..5efbae3 100644
--- a/template/admin/html/user/item.php
+++ b/template/admin/html/user/item.php
@@ -1,6 +1,6 @@
 <li class="item-list-li user">
 	<header>
-		<h2><i class="fa fa-user"></i><?=escapeHTML($USER['ATTR']['FULLNAME'])?><span>#<?=$USER['ID']?></span></h2>
+		<h2><i class="fa fa-user"></i><?=escapeHTML($USER['ATTR']['FULLNAME'])?><span>#<?=$USER['ATTR']['ID']?></span></h2>
 		<div>
 			<time class="brackets" datetime="<?=$USER['ATTR']['TIME_INSERT']?>"><?=parseDatetime($USER['ATTR']['TIME_INSERT'], $Language->template('date_format'))?></time>
 		</div>
@@ -20,8 +20,8 @@
 	<footer>
 		<ul>
 			<li><a href="<?=$USER['URL']?>" target="_blank" title="<?=$Language->text('select_user')?>"><i class="fa fa-external-link"></i></a></li>
-			<li><a href="<?=Application::getAdminURL("user/update.php?id={$USER['ID']}")?>" title="<?=$Language->text('update_user')?>"><i class="fa fa-pencil-square-o"></i></a></li>
-			<li><a href="<?=Application::getAdminURL("user/delete.php?id={$USER['ID']}")?>" title="<?=$Language->text('delete_user')?>"><i class="fa fa-trash-o"></i></a></li>
+			<li><a href="<?=Application::getAdminURL("user/update.php?id={$USER['ATTR']['ID']}")?>" title="<?=$Language->text('update_user')?>"><i class="fa fa-pencil-square-o"></i></a></li>
+			<li><a href="<?=Application::getAdminURL("user/delete.php?id={$USER['ATTR']['ID']}")?>" title="<?=$Language->text('delete_user')?>"><i class="fa fa-trash-o"></i></a></li>
 		</ul>
 	</footer>
 </li>
\ No newline at end of file