diff --git a/module/action/model.php b/module/action/model.php
index 701f70d153..75e4b8cf66 100755
--- a/module/action/model.php
+++ b/module/action/model.php
@@ -197,7 +197,6 @@ class actionModel extends model
         $this->loadModel('workflow');
         foreach($actions as $actionID => $action)
         {
-            $extra      = $action->extra;
             $actionName = strtolower($action->action);
             if($this->config->edition != 'open' && !isset($flowList[$action->objectType])) $flowList[$action->objectType] = $this->workflow->getByModule($action->objectType);
 
@@ -1172,7 +1171,7 @@ class actionModel extends model
 
         /* If idList include ',*,' Format ',*,' to '*'. */
         $projectIdList = array();
-        foreach($projectGroups as $key => $idList)
+        foreach($projectGroups as $idList)
         {
             $idList = explode(',', (string)$idList);
             foreach($idList as $id) $projectIdList[] = $id;
diff --git a/module/bug/model.php b/module/bug/model.php
index cd61b8cefd..c0d51afa2d 100644
--- a/module/bug/model.php
+++ b/module/bug/model.php
@@ -41,7 +41,7 @@ class bugModel extends model
         if(!empty($bug->assignedTo)) $this->action->create('bug', $bugID, 'Assigned', '', $bug->assignedTo);
 
         /* Add score for create. */
-        $files = $this->loadModel('file')->saveUpload('bug', $bugID);
+        $this->loadModel('file')->saveUpload('bug', $bugID);
         if(!empty($bug->case))
         {
             $this->loadModel('score')->create('bug', 'createFormCase', $bug->case);
diff --git a/module/bug/zen.php b/module/bug/zen.php
index c955b48d72..e8b3eca51c 100644
--- a/module/bug/zen.php
+++ b/module/bug/zen.php
@@ -1163,7 +1163,7 @@ class bugZen extends bug
         if($product->type != 'normal') $branchTagOption = $this->getBranchOptions($product->id);
         if($this->config->edition == 'max') $this->view->injectionList = $this->view->identifyList = $this->loadModel('review')->getPairs($bug->project, $bug->product, true);
 
-        $this->assignVarsForEdit($bug);
+        $this->assignVarsForEdit($bug, $product);
 
         $this->view->title                 = $this->lang->bug->edit . "BUG #$bug->id $bug->title - " . $this->products[$bug->product];
         $this->view->bug                   = $bug;
@@ -1181,10 +1181,11 @@ class bugZen extends bug
      * Assign variables for editing bug.
      *
      * @param  object    $bug
+     * @param  object    $product
      * @access protected
      * @return void
      */
-    protected function assignVarsForEdit(object $bug): void
+    protected function assignVarsForEdit(object $bug, object $product): void
     {
         /* Add product related to the bug when it is not in the products. */
         if(!isset($this->products[$bug->product]))
diff --git a/module/caselib/zen.php b/module/caselib/zen.php
index 277c9951f2..28a7156c4c 100644
--- a/module/caselib/zen.php
+++ b/module/caselib/zen.php
@@ -245,8 +245,8 @@ class caselibZen extends caselib
 
                 if(empty($rows))
                 {
-                    $row->typeValue  = join("\n", $this->lang->testcase->typeList);
-                    $row->stageValue = join("\n", $this->lang->testcase->stageList);
+                    $row->typeValue  = implode("\n", $this->lang->testcase->typeList);
+                    $row->stageValue = implode("\n", $this->lang->testcase->stageList);
                 }
 
                 $rows[] = $row;
@@ -444,7 +444,7 @@ class caselibZen extends caselib
 
                         $case->stage = array();
                         foreach($stages as $stage) $case->stage[] = array_search($stage, $this->lang->testcase->stageList);
-                        $case->stage = join(',', $case->stage);
+                        $case->stage = implode(',', $case->stage);
                     }
                     else
                     {
@@ -558,7 +558,6 @@ class caselibZen extends caselib
     {
         $users          = $this->loadModel('user')->getPairs('noletter');
         $relatedModules = $this->loadModel('tree')->getModulePairs($libID, 'caselib');
-        $relatedCases   = $this->loadModel('testcase')->getRelatedCases($cases);
         $relatedSteps   = $this->testcase->getRelatedSteps(array_keys($cases));
         $relatedFiles   = $this->testcase->getRelatedFiles(array_keys($cases));
 
@@ -655,7 +654,7 @@ class caselibZen extends caselib
     {
         $case->stage = explode(',', $case->stage);
         foreach($case->stage as $key => $stage) $case->stage[$key] = isset($this->lang->testcase->stageList[$stage]) ? $this->lang->testcase->stageList[$stage] : $stage;
-        $case->stage = join("\n", $case->stage);
+        $case->stage = implode("\n", $case->stage);
     }
 
     /**
@@ -697,6 +696,6 @@ class caselibZen extends caselib
             $linkCaseID = trim($linkCaseID);
             $tmpLinkCases[] = isset($relatedCases[$linkCaseID]) ? $relatedCases[$linkCaseID] . "(#$linkCaseID)" : $linkCaseID;
         }
-        $case->linkCase = join("; \n", $tmpLinkCases);
+        $case->linkCase = implode("; \n", $tmpLinkCases);
     }
 }
diff --git a/module/custom/control.php b/module/custom/control.php
index 1d4cc17991..b9ee63b120 100644
--- a/module/custom/control.php
+++ b/module/custom/control.php
@@ -595,7 +595,7 @@ class custom extends control
                 $menus    = json_decode($items);
 
                 $menuNames = array();
-                foreach($menus as $key => $item) $menuNames[] = $item->name;
+                foreach($menus as $item) $menuNames[] = $item->name;
 
                 foreach($oldMenus as $key => $item)
                 {
diff --git a/module/execution/control.php b/module/execution/control.php
index 3c7d0dca59..566acc0a44 100644
--- a/module/execution/control.php
+++ b/module/execution/control.php
@@ -3495,7 +3495,7 @@ class execution extends control
         $this->loadModel('task');
 
         $result = array();
-        foreach($array as $key => $object)
+        foreach($array as $object)
         {
             $result[$object->id] = $object;
             $tasks = zget($object, 'tasks', array());