registration and login form in php and mysql code example

Example 1: how to make a working login system using code

<!DOCTYPE html>
<html>
<head>
	<title>Login</title>
	<script>
  firebase.initializeApp(firebaseConfig);
  const auth = firebase.auth();
  function signUp(){
    var email = document.getElementById("email");
    var password = document.getElementById("password");
    const promise = auth.createUserWithEmailAndPassword(email.value, password.value);
    promise.catch(e => alert(e.message));
    alert("Signed Up");
  }
  function signIn(){
    var email = document.getElementById("email");
    var password = document.getElementById("password");
    const promise = auth.signInWithEmailAndPassword(email.value, password.value);
    promise.catch(e => alert(e.message));
  }
  function signOut(){
    auth.signOut();
    alert("Signed Out");
  }

auth.onAuthStateChanged(function(user){
    if(user){
      var email = user.email;
      alert("Signed in as " + email);
      //Take user to a different or home page

      //is signed in
    }else{
      alert("No Active User");
      //no user is signed in
    }
  });g
	</script>
<style type="text/css">
	body{
	background-color: #55d6aa;
}
h1{
	background-color: #ff4d4d;
	margin: 10px auto;
	text-align: center;
	color: white;
}
#formContainer{
	background-color: white;
	box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 17px 50px 0 rgba(0,0,0,0.19);

	width: 25%;
	height: 45;
	margin: 10px auto;
}
#header{
	width: 100%;
	height: 10px;
	background: black;
}
#email{
	width: 70%;
	height: 40px;
	display:block;
	margin: 25px auto;
	border: none;
	outline: none;
	border-bottom: 2px solid black;
}
#password{
	width: 70%;
	height: 40px;
	display: block;
	margin: 10px auto;
	border: none;
	outline: none;
	border-bottom: 2px solid black;
}
#signUp{
	background-color: #ff4d4d;
	color: white;
	border: none;
	font-weight: bold;
	padding: 15px 32px;
	border-radius: 10px;
	text-align: center;
	text-decoration: none;
	display: inline-block;
	font-size: 13px;
	margin-top: 20px;
	margin-left: 50px;
}
#signIn{
	background-color: #32ff7e;
	color: white;
	font-weight: bold;
	border: none;
	padding: 15px 35px;
	border-radius: 10px;
	text-align: center;
	text-decoration: none;
	font-size: 13px
}
#signOut{
	background-color: #FFA500;
	color: white;
	border: none;
	padding: 12px 32px;
	border-radius: 10px;
	text-align: center;
	text-decoration: none;
	display: inline-block;
	font-size: 13px;
	margin-top: 9px;
	margin-left: 74px;
	font-weight: bold;
}
button: hover{
box-shadow: 0 12px 16px 0 rgba(0,0,0,0.24), 0 7px 50px 0 rgba(0,0,0,0,.19);
}
</style>
</head>
<body>
	<h1>Login Here</h1>
	<div id="formContainer">
		<div id="header"> </div>
  <input type="email" placeholder="Email" id="email">
  <input type="password" placeholder="Password" id="password">

 <button onclick="signUp()" id="signUp"> Sign Up </button>
  <button onclick="signIn()" id="signIn"> Sign In </button>
  <button onclick="signOut()" id="signOut"> Sign Out </button>
Continue</a>
</body>
</html>

Example 2: 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 3: how to make a sign-up database

<html>
<head>
<title>PHP User Registration Form</title>
<link href="./css/style.css" rel="stylesheet" type="text/css" />
</head>
<body>
    <form name="frmRegistration" method="post" action="">
        <div class="demo-table">
        <div class="form-head">Sign Up</div>
            
<?php
if (! empty($errorMessage) && is_array($errorMessage)) {
    ?>	
            <div class="error-message">
            <?php 
            foreach($errorMessage as $message) {
                echo $message . "<br/>";
            }
            ?>
            </div>
<?php
}
?>
            <div class="field-column">
                <label>Username</label>
                <div>
                    <input type="text" class="demo-input-box"
                        name="userName"
                        value="<?php if(isset($_POST['userName'])) echo $_POST['userName']; ?>">
                </div>
            </div>
            
            <div class="field-column">
                <label>Password</label>
                <div><input type="password" class="demo-input-box"
                    name="password" value=""></div>
            </div>
            <div class="field-column">
                <label>Confirm Password</label>
                <div>
                    <input type="password" class="demo-input-box"
                        name="confirm_password" value="">
                </div>
            </div>
            <div class="field-column">
                <label>Display Name</label>
                <div>
                    <input type="text" class="demo-input-box"
                        name="firstName"
                        value="<?php if(isset($_POST['firstName'])) echo $_POST['firstName']; ?>">
                </div>

            </div>
            <div class="field-column">
                <label>Email</label>
                <div>
                    <input type="text" class="demo-input-box"
                        name="userEmail"
                        value="<?php if(isset($_POST['userEmail'])) echo $_POST['userEmail']; ?>">
                </div>
            </div>
            <div class="field-column">
                <div class="terms">
                    <input type="checkbox" name="terms"> I accept terms
                    and conditions
                </div>
                <div>
                    <input type="submit"
                        name="register-user" value="Register"
                        class="btnRegister">
                </div>
            </div>
        </div>
    </form>
</body>
</html>

Example 4: 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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