In this example we using Models, Views, Controller Structure for Checking Existing User in the database.
To Check Existing User in the database first we have to create a table.
register table
CREATE TABLE IF NOT EXISTS `register` (
`id` int(11) NOT NULL,
`user_name` varchar(50) NOT NULL,
`email_id` varchar(50) NOT NULL,
`password` varchar(50) NOT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;
Here is the model file which we are using for check user.
The file register_model.php is created under Models folder
models/register_model.php
<?php
class Register_Model extends Model
{
public function __construct()
{
parent::__construct();
}
public function check_user($user_name,$email_id)
{
$result= $this->db->select("SELECT * FROM `register` WHERE user_name = '".$user_name."' OR email_id = '".$email_id."'");
$count = count($result);
return $count;
}
public function insert_user($data)
{
$this->db->insert('register', $data);
}
}
?>
Here is the view file register.php which inside views folder contains the form
views/register/register.php
<!DOCTYPE html>
<html>
<body>
<form method="post" action="<?php echo URL; ?>register/check_user">
First name:<br>
<input type="text" name="user_name" >
<br>
Last name:<br>
<input type="text" name="email_id">
<br><br>
Password:<br>
<input type="password" name="password">
<br><br>
<input type="submit" value="Submit">
</form>
</body>
</html>
Here is the Controller file register.php which inside controllers folder
controllers/register.php
<?php
class Register extends Controller
{
public function __construct()
{
parent::__construct();
}
function check_user(){
$user_name=$_POST['user_name'];
$email_id=$_POST['email_id'];
$count=$this->model->check_user($user_name,$email_id);
if($count > 0){
echo 'This User Already Exists';
}
else{
$data = array(
'id' =>null,
'user_name' =>$_POST['user_name'],
'email_id' =>$_POST['email_id'],
'password' =>$_POST['password']
);
$this->model->insert_user($data);
}
header('location:register');
}
}
?>
