Database backup manual

Route::get('database/backup','DatabaseBackupController@databaseBeckup')->name('database.backup');

function databaseBackup()
    {
       //ENTER THE RELEVANT INFO BELOW
       $mysqlHostName      = env('DB_HOST');
       $mysqlUserName      = env('DB_USERNAME');
       $mysqlPassword      = env('DB_PASSWORD');
       $DbName             = env('DB_DATABASE');
       $file_name = 'database_backup_on_' . date('y-m-d') . '.sql';


       $queryTables = \DB::select(\DB::raw('SHOW TABLES'));
        foreach ( $queryTables as $table )
        {
            foreach ( $table as $tName)
            {
                $tables[]= $tName ;
            }
        }
      // $tables  = array("users","products","categories"); //here your tables...

       $connect = new \PDO("mysql:host=$mysqlHostName;dbname=$DbName;charset=utf8", "$mysqlUserName", "$mysqlPassword",array(\PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES 'utf8'"));
       $get_all_table_query = "SHOW TABLES";
       $statement = $connect->prepare($get_all_table_query);
       $statement->execute();
       $result = $statement->fetchAll();
       $output = '';
       foreach($tables as $table)
       {
           $show_table_query = "SHOW CREATE TABLE " . $table . "";
           $statement = $connect->prepare($show_table_query);
           $statement->execute();
           $show_table_result = $statement->fetchAll();

           foreach($show_table_result as $show_table_row)
           {
               $output .= "\n\n" . $show_table_row["Create Table"] . ";\n\n";
           }
           $select_query = "SELECT * FROM " . $table . "";
           $statement = $connect->prepare($select_query);
           $statement->execute();
           $total_row = $statement->rowCount();

           for($count=0; $count<$total_row; $count++)
           {
               $single_result = $statement->fetch(\PDO::FETCH_ASSOC);
               $table_column_array = array_keys($single_result);
               $table_value_array = array_values($single_result);
               $output .= "\nINSERT INTO $table (";
               $output .= "" . implode(", ", $table_column_array) . ") VALUES (";
               $output .= "'" . implode("','", $table_value_array) . "');\n";
           }
       }

       $file_handle = fopen($file_name, 'w+');
       fwrite($file_handle, $output);
       fclose($file_handle);
       header('Content-Description: File Transfer');
       header('Content-Type: application/octet-stream');
       header('Content-Disposition: attachment; filename=' . basename($file_name));
       header('Content-Transfer-Encoding: binary');
       header('Expires: 0');
       header('Cache-Control: must-revalidate');
       header('Pragma: public');
       header('Content-Length: ' . filesize($file_name));
       ob_clean();
       flush();
       readfile($file_name);
       unlink($file_name);
    }