Do not add unnecessary parameters in the archive link (#19447)

* Do not add unnecessary parameters in the archive link

* Remove php notice

* Unset parameter month=0 when year is not set

components/com_content/helpers/legacyrouter.php

@@ -225,25 +225,34 @@ public function build(&$query, &$segments)
 			if (!$menuItemGiven)
 			{
 				$segments[] = $view;
-				unset($query['view']);
 			}
 
-			if (isset($query['year']))
+			unset($query['view']);
+
+			// If there is no year segment then do not add month segment
+			if (isset($query['year']) && $menuItemGiven)
 			{
-				if ($menuItemGiven)
+				if ($query['year'])
 				{
 					$segments[] = $query['year'];
-					unset($query['year']);
+
+					if (isset($query['month']))
+					{
+						if ($query['month'])
+						{
+							$segments[] = $query['month'];
+						}
+
+						unset($query['month']);
+					}
 				}
+
+				unset($query['year']);
 			}
 
-			if (isset($query['month']))
+			if (isset($query['month']) && empty($query['month']))
 			{
-				if ($menuItemGiven)
-				{
-					$segments[] = $query['month'];
-					unset($query['month']);
-				}
+				unset($query['month']);
 			}
 		}
 
@@ -320,14 +329,33 @@ public function parse(&$segments, &$vars)
 		 * Standard routing for articles.  If we don't pick up an Itemid then we get the view from the segments
 		 * the first segment is the view and the last segment is the id of the article or category.
 		 */
-		if (!isset($item))
+		if ($item === null)
 		{
 			$vars['view'] = $segments[0];
 			$vars['id'] = $segments[$count - 1];
 
 			return;
 		}
 
+		// Manage the archive view
+		if ($item->query['view'] === 'archive')
+		{
+			$vars['view']  = 'archive';
+
+			if ($count >= 2)
+			{
+				$vars['year']  = $segments[$count - 2];
+				$vars['month'] = $segments[$count - 1];
+			}
+			else
+			{
+				$vars['year']  = $segments[$count - 1];
+				$vars['month'] = null;
+			}
+
+			return;
+		}
+
 		/*
 		 * If there is only one segment, then it points to either an article or a category.
 		 * We test it first to see if it is a category.  If the id and alias match a category,
@@ -384,7 +412,7 @@ public function parse(&$segments, &$vars)
 		 * because the first segment will have the target category id prepended to it.  If the
 		 * last segment has a number prepended, it is an article, otherwise, it is a category.
 		 */
-		if ((!$advanced) && ($item->query['view'] !== 'archive'))
+		if ((!$advanced))
 		{
 			$cat_id = (int) $segments[0];
 
@@ -405,16 +433,6 @@ public function parse(&$segments, &$vars)
 			return;
 		}
 
-		// Manage the archive view
-		if ($item->query['view'] == 'archive' && $count !== 1)
-		{
-			$vars['year']  = $count >= 2 ? $segments[$count - 2] : null;
-			$vars['month'] = $segments[$count - 1];
-			$vars['view']  = 'archive';
-
-			return;	
-		}
-
 		// We get the category id from the menu item and search from there
 		$id = $item->query['id'];
 		$category = JCategories::getInstance('Content')->get($id);