For storing the multiple values in the database through check box, when a user select multiple choices,that selected value will be shown in database For Example a user want to select their education in the form so it will shown in database in one column by using explode() function it will Split a string by string, so this will allow different values to the database table.

<?php
<input type="checkbox" value="10" name="education[]">10th
<input type="checkbox" value="12" name="education[]">12th
<input type="checkbox" value="btech" name="education[]">Btech
<input type="checkbox" value="btech" name="education[]">Mtech
<input type="checkbox" value="btech" name="education[]">phd
?>

controller code:

   function register()
      {		
      
      		if($this->request->data)
                   {

      		        pr($this->request->data);
      			$education = $this->request->data['education'];

      		             $output = implode(',',$education);
      			
      			$this->request->data['education'] = $output;

      			$this->request->data['password'] = md5($this->request->data['password']);

      			if($this->User->save($this->request->data))
                             {
      				 $this->Session->setFlash('Registration successfully!!');  
     				 $this->redirect(array('action'=>'login'));
      			     }
      			else
                             {
      				 $this->Session->setFlash('Something went wrong!');  
     				 $this->redirect(array('action'=>'login'));
      			     }
      	
      	            }
      }