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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  _   __ __ _____ _____ ___  ____  _____  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * | | / // // ___//_  _//   ||  __||_   _|  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * | |/ // /(__  )  / / / /| || |     | |  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * |___//_//____/  /_/ /_/ |_||_|     |_|  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @link https://vistart.name/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright Copyright (c) 2016 vistart  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license https://vistart.name/license/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace vistart\Models\traits;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use yii\base\ModelEvent;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * This trait is used for building notification model.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @version 2.0  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author vistart <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait NotificationTrait  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    use NotificationRangeTrait;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public $notificationReadClass;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public $linkAttribute = false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getLink()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $linkAttribute = $this->linkAttribute;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_string($linkAttribute)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->$linkAttribute;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return null;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function setLink($link)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $linkAttribute = $this->linkAttribute;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_string($linkAttribute)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return $this->$linkAttribute = $link;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function getNotificationRules()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $rules = $this->getNotificationRangeRules();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_string($this->linkAttribute)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $rules[] = [  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->linkAttribute, 'string',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $rules;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                    public function enabledFields()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $fields = parent::enabledFields();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (is_string($this->linkAttribute)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $fields[] = $this->linkAttribute;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if (is_string($this->rangeAttribute)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $fields[] = $this->rangeAttribute;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        return $fields;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @inheritdoc  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function rules()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return array_merge(parent::rules(), $this->getNotificationRules());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *   | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param ModelEvent $event  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return integer|false  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function onDeleteNotificationRead($event)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $sender = $event->sender;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        /* @var $sender static */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (!is_string($sender->notificationReadClass)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $notificationReadClass = $sender->notificationReadClass;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $notificationReadModels = $notificationReadClass::find()->content($sender->guid)->all();  | 
            
                            
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                        $count = 0;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        foreach ($notificationReadModels as $model) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $count += $model->delete();  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        return $count;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code:
Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: