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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.me/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @copyright Copyright (c) 2016 - 2017 vistart  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @license https://vistart.me/license/  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace rhosocial\user\models\migrations;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use rhosocial\user\migrations\Migration;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use rhosocial\user\models\Username;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use rhosocial\user\User;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * Class m170507_131103_createUsernameTable  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @version 1.0  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 * @author vistart <[email protected]>  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                 */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                class m170507_131103_createUsernameTable extends Migration  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                { | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function up()  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $tableOptions = null;  | 
            
                            
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                        if ($this->db->driverName == 'mysql') { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            // http://stackoverflow.com/questions/766809/whats-the-difference-between-utf8-general-ci-and-utf8-unicode-ci  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $tableOptions = "CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE=InnoDB COMMENT='Username'";  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $this->createTable(Username::tableName(), [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                'guid' => $this->varbinary(16)->notNull()->comment('User GUID'), | 
            
            
                                                                        
                            
            
                                    
            
            
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                                'content' => $this->varchar(32)->charset('utf8mb4')->collate('utf8mb4_unicode_ci')->defaultValue('')->notNull()->comment('Username'), | 
            
            
                                                                        
                            
            
                                    
            
            
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                                'ip' => $this->varbinary(16)->defaultValue(0)->notNull()->comment('IP Address'), | 
            
            
                                                                        
                            
            
                                    
            
            
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                                'ip_type' => $this->smallInteger()->defaultValue(4)->notNull()->comment('IP Address Type'), | 
            
            
                                                                        
                            
            
                                    
            
            
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                                'created_at' => $this->dateTime()->notNull()->defaultValue('1970-01-01 00:00:00')->comment('Created At'), | 
            
            
                                                                        
                            
            
                                    
            
            
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                                'updated_at' => $this->dateTime()->notNull()->defaultValue('1970-01-01 00:00:00')->comment('Updated At'), | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ], $tableOptions);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->addPrimaryKey('user_username_guid_pk', Username::tableName(), 'guid'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->addForeignKey('user_username_fk', Username::tableName(), 'guid', User::tableName(), 'guid', 'CASCADE', 'CASCADE'); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $this->createIndex('username_unique', Username::tableName(), 'content', true); | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function down()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        $this->dropTable(Username::tableName());  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /*  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    // Use safeUp/safeDown to run migration code within a transaction  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function safeUp()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function safeDown()  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    */  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.