| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  |  * @link http://www.yiiframework.com/ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  |  * @copyright Copyright (c) 2008 Yii Software LLC | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  |  * @license http://www.yiiframework.com/license/ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  | namespace zacksleo\yii2\backend\widgets; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  |  * Alert widget renders a message from session flash. All flash messages are displayed | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  |  * in the sequence they were assigned using setFlash. You can set message as following: | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  |  * - \Yii::$app->getSession()->setFlash('error', 'This is the message'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  |  * - \Yii::$app->getSession()->setFlash('success', 'This is the message'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  |  * - \Yii::$app->getSession()->setFlash('info', 'This is the message'); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  |  * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  |  * @author Kartik Visweswaran <[email protected]> | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  |  * @author Alexander Makarov <[email protected]> | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 20 |  |  |  */ | 
            
                                                                        
                            
            
                                    
            
            
                | 21 |  |  | class Alert extends \yii\bootstrap\Widget | 
            
                                                                        
                            
            
                                    
            
            
                | 22 |  |  | { | 
            
                                                                        
                            
            
                                    
            
            
                | 23 |  |  |     /** | 
            
                                                                        
                            
            
                                    
            
            
                | 24 |  |  |      * @var array the alert types configuration for the flash messages. | 
            
                                                                        
                            
            
                                    
            
            
                | 25 |  |  |      * This array is setup as $key => $value, where: | 
            
                                                                        
                            
            
                                    
            
            
                | 26 |  |  |      * - $key is the name of the session flash variable | 
            
                                                                        
                            
            
                                    
            
            
                | 27 |  |  |      * - $value is the bootstrap alert type (i.e. danger, success, info, warning) | 
            
                                                                        
                            
            
                                    
            
            
                | 28 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 29 |  |  |     public $alertTypes = [ | 
            
                                                                        
                            
            
                                    
            
            
                | 30 |  |  |         'error' => 'alert-danger', | 
            
                                                                        
                            
            
                                    
            
            
                | 31 |  |  |         'danger' => 'alert-danger', | 
            
                                                                        
                            
            
                                    
            
            
                | 32 |  |  |         'success' => 'alert-success', | 
            
                                                                        
                            
            
                                    
            
            
                | 33 |  |  |         'info' => 'alert-info', | 
            
                                                                        
                            
            
                                    
            
            
                | 34 |  |  |         'warning' => 'alert-warning' | 
            
                                                                        
                            
            
                                    
            
            
                | 35 |  |  |     ]; | 
            
                                                                        
                            
            
                                    
            
            
                | 36 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 37 |  |  |     /** | 
            
                                                                        
                            
            
                                    
            
            
                | 38 |  |  |      * @var array the options for rendering the close button tag. | 
            
                                                                        
                            
            
                                    
            
            
                | 39 |  |  |      */ | 
            
                                                                        
                            
            
                                    
            
            
                | 40 |  |  |     public $closeButton = []; | 
            
                                                                        
                            
            
                                    
            
            
                | 41 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  |     public function init() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  |     { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  |         parent::init(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  |         $session = \Yii::$app->getSession(); | 
                            
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                | 47 |  |  |         $flashes = $session->getAllFlashes(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  |         $appendCss = isset($this->options['class']) ? ' ' . $this->options['class'] : ''; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 49 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 50 |  |  |         foreach ($flashes as $type => $message) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 51 |  |  |             if (isset($this->alertTypes[$type])) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 52 |  |  |                 /* initialize css class for each alert box */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 53 |  |  |                 $this->options['class'] = $this->alertTypes[$type] . $appendCss; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 54 |  |  |                 /* assign unique id to each alert box */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 55 |  |  |                 $this->options['id'] = $this->getId() . '-' . $type; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 56 |  |  |                 if (is_array($message)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 57 |  |  |                     foreach ($message as $msg) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |                         echo \yii\bootstrap\Alert::widget([ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  |                             'body' => $msg, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  |                             'closeButton' => $this->closeButton, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  |                             'options' => $this->options, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  |                         ]); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  |                     } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  |                 } else { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  |                     echo \yii\bootstrap\Alert::widget([ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  |                         'body' => $message, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |                         'closeButton' => $this->closeButton, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 68 |  |  |                         'options' => $this->options, | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  |                     ]); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  |                 } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 71 |  |  |                 $session->removeFlash($type); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 72 |  |  |             } | 
            
                                                                                                            
                            
            
                                    
            
            
                | 73 |  |  |         } | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 74 |  |  |     } | 
            
                                                        
            
                                    
            
            
                | 75 |  |  | } | 
            
                                                        
            
                                    
            
            
                | 76 |  |  |  | 
            
                        
It seems like the method you are trying to call exists only in some of the possible types.
Let’s take a look at an example:
Available Fixes
Add an additional type-check:
Only allow a single type to be passed if the variable comes from a parameter: