registation form php

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Gabriela
11 Mar 2020
1<?php
2session_start();
3
4// initializing variables
5$username = "";
6$email    = "";
7$errors = array(); 
8
9// connect to the database
10$db = mysqli_connect('localhost', 'root', '', 'registration');
11
12// REGISTER USER
13if (isset($_POST['reg_user'])) {
14  // receive all input values from the form
15  $username = mysqli_real_escape_string($db, $_POST['username']);
16  $email = mysqli_real_escape_string($db, $_POST['email']);
17  $password_1 = mysqli_real_escape_string($db, $_POST['password_1']);
18  $password_2 = mysqli_real_escape_string($db, $_POST['password_2']);
19
20  // form validation: ensure that the form is correctly filled ...
21  // by adding (array_push()) corresponding error unto $errors array
22  if (empty($username)) { array_push($errors, "Username is required"); }
23  if (empty($email)) { array_push($errors, "Email is required"); }
24  if (empty($password_1)) { array_push($errors, "Password is required"); }
25  if ($password_1 != $password_2) {
26	array_push($errors, "The two passwords do not match");
27  }
28
29  // first check the database to make sure 
30  // a user does not already exist with the same username and/or email
31  $user_check_query = "SELECT * FROM users WHERE username='$username' OR email='$email' LIMIT 1";
32  $result = mysqli_query($db, $user_check_query);
33  $user = mysqli_fetch_assoc($result);
34  
35  if ($user) { // if user exists
36    if ($user['username'] === $username) {
37      array_push($errors, "Username already exists");
38    }
39
40    if ($user['email'] === $email) {
41      array_push($errors, "email already exists");
42    }
43  }
44
45  // Finally, register user if there are no errors in the form
46  if (count($errors) == 0) {
47  	$password = md5($password_1);//encrypt the password before saving in the database
48
49  	$query = "INSERT INTO users (username, email, password) 
50  			  VALUES('$username', '$email', '$password')";
51  	mysqli_query($db, $query);
52  	$_SESSION['username'] = $username;
53  	$_SESSION['success'] = "You are now logged in";
54  	header('location: index.php');
55  }
56}
57
58// ... 
59
source
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