title: having trouble with mysqli query default value
body: <p>i am working with mysqli query and i want to set default value for perticular column getting that value from variable 
  i have tried a lot i could not get any solution on internet
  if there is any expert with mysqli help me out of this
  $route_name, $from, $to value of this variable should be take as  default value
  here is my query </p>
  
  <pre><code>CREATE TABLE $route_table_name (
  route_id INT(11) UNSIGNED AUTO_INCREMENT PRIMARY KEY,
  bus_id INT(11),
  route_name VARCHAR(100) DEFAULT $route_name,
  route_from VARCHAR(100) DEFAULT $from,
  route_to VARCHAR(100) DEFAULT $to
  )
  </code></pre>