login registration form php mysql code example

Example 1: php user login and registration

<?php
session_start();

// initializing variables
$username = "";
$email    = "";
$errors = array(); 

// connect to the database
$db = mysqli_connect('localhost', 'root', '', 'registration');

// REGISTER USER
if (isset($_POST['reg_user'])) {
  // receive all input values from the form
  $username = mysqli_real_escape_string($db, $_POST['username']);
  $email = mysqli_real_escape_string($db, $_POST['email']);
  $password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
  $password_2 = mysqli_real_escape_string($db, $_POST['password_2']);

  // form validation: ensure that the form is correctly filled ...
  // by adding (array_push()) corresponding error unto $errors array
  if (empty($username)) { array_push($errors, "Username is required"); }
  if (empty($email)) { array_push($errors, "Email is required"); }
  if (empty($password_1)) { array_push($errors, "Password is required"); }
  if ($password_1 != $password_2) {
	array_push($errors, "The two passwords do not match");
  }

  // first check the database to make sure 
  // a user does not already exist with the same username and/or email
  $user_check_query = "SELECT * FROM users WHERE username='$username' OR email='$email' LIMIT 1";
  $result = mysqli_query($db, $user_check_query);
  $user = mysqli_fetch_assoc($result);
  
  if ($user) { // if user exists
    if ($user['username'] === $username) {
      array_push($errors, "Username already exists");
    }

    if ($user['email'] === $email) {
      array_push($errors, "email already exists");
    }
  }

  // Finally, register user if there are no errors in the form
  if (count($errors) == 0) {
  	$password = md5($password_1);//encrypt the password before saving in the database

  	$query = "INSERT INTO users (username, email, password) 
  			  VALUES('$username', '$email', '$password')";
  	mysqli_query($db, $query);
  	$_SESSION['username'] = $username;
  	$_SESSION['success'] = "You are now logged in";
  	header('location: index.php');
  }
}

// ...

Example 2: registration form in php and mysql

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>Registration Form</title>
<style>
input,textarea{width:200px}
input[type=radio],input[type=checkbox]{width:10px}
input[type=submit],input[type=reset]{width:100px}
</style>
</head>

<body>
<form method="post" enctype="multipart/form-data">
<table width="393" border="1">
 <tr>
 	<td colspan="2"><?php echo @$msg; ?></td>
 </tr>
  <tr>
    <td width="159">Enter your Name</td>
    <td width="218">
	<input type="text" placeholder="your first name"  name="n" pattern="[a-z A-Z]*" required /></td>
  </tr>
  <tr>
    <td>Enter your Email</td>
    <td><input type="email" name="e"/></td>
  </tr>
  <tr>
    <td>Enter your Password</td>
    <td><input type="password" name="p"/></td>
  </tr>
  <tr>
    <td>Enter your Address</td>
    <td><textarea name="add"></textarea></td>
  </tr>
  <tr>
    <td>Enter your Mobile</td>
    <td><input type="text" pattern="[0-9]*" name="m" /></td>
  </tr>
  <tr>
    <td height="23">Select your Gender</td>
    <td>
	Male<input type="radio" name="g" value="m"/>
	Female<input type="radio" name="g" value="f"/>
	</td>
  </tr>
  <tr>
    <td>Choose your Hobbies</td>
    <td>
		Cricket<input type="checkbox" value="cricket" name="hobb[]"/>
		Singing<input type="checkbox" value="singing" name="hobb[]"/>
		Dancing<input type="checkbox" value="dancing" name="hobb[]"/>
	</td>
  </tr>
  <tr>
    <td>Choose your Profile Pic </td>
    <td><input type="file" name="pic"/></td>
  </tr>
  <tr>
    <td>Select your DOB</td>
    <td>
		<select name="mm">
			<option value="">Month</option>
			<?php 
			for($i=1;$i<=12;$i++)
			{
			echo "<option value='$i'>".$i."</option>";
			}
			?>
		</select>
		<select name="dd">
			<option value="">Date</option>
			<?php 
			for($i=1;$i<=31;$i++)
			{
			echo "<option value='$i'>".$i."</option>";
			}
			?>
		</select>
		<select name="yy">
			<option value="">Year</option>
			<?php 
			for($i=1900;$i<=2015;$i++)
			{
			echo "<option value='$i'>".$i."</option>";
			}
			?>
		</select>
	</td>
  </tr>
  <tr>
    <td colspan="2" align="center">
	<input type="submit" name="save" value="Register Me"/>
	<input type="reset" value="Reset"/>
	</td>
  </tr>
</table>
</form>
</body>
</html>

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