Example 1: php login form
<?php
include("config.php");
session_start();
if($_SERVER["REQUEST_METHOD"] == "POST") {
// username and password sent from form
$myusername = mysqli_real_escape_string($db,$_POST['username']);
$mypassword = mysqli_real_escape_string($db,$_POST['password']);
$sql = "SELECT id FROM admin WHERE username = '$myusername' and passcode = '$mypassword'";
$result = mysqli_query($db,$sql);
$row = mysqli_fetch_array($result,MYSQLI_ASSOC);
$active = $row['active'];
$count = mysqli_num_rows($result);
// If result matched $myusername and $mypassword, table row must be 1 row
if($count == 1) {
session_register("myusername");
$_SESSION['login_user'] = $myusername;
header("location: welcome.php");
}else {
$error = "Your Login Name or Password is invalid";
}
}
?>
<html>
<head>
<title>Login Page</title>
<style type = "text/css">
body {
font-family:Arial, Helvetica, sans-serif;
font-size:14px;
}
label {
font-weight:bold;
width:100px;
font-size:14px;
}
.box {
border:#666666 solid 1px;
}
</style>
</head>
<body bgcolor = "#FFFFFF">
<div align = "center">
<div style = "width:300px; border: solid 1px #333333; " align = "left">
<div style = "background-color:#333333; color:#FFFFFF; padding:3px;"><b>Login</b></div>
<div style = "margin:30px">
<form action = "" method = "post">
<label>UserName :</label><input type = "text" name = "username" class = "box"/><br /><br />
<label>Password :</label><input type = "password" name = "password" class = "box" /><br/><br />
<input type = "submit" value = " Submit "/><br />
</form>
<div style = "font-size:11px; color:#cc0000; margin-top:10px"><?php echo $error; ?></div>
</div>
</div>
</div>
</body>
</html>
Example 2: 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);
}else{
alert("No Active User");
}
});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 3: login php
<?php
session_start();
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Login</title>
</head>
<body>
<form action="" method="POST">
<input type="password" name="password">
<button type="submit" name="submit">Login</button>
</form>
<?php
if(isset($_POST['submit'])){
if(password_verify($_POST['password'], '$2y$10$sejeRNYZGaoPh1EwfcuO1.hxl/uepQOh9SITWWgeej86vnMt26KIa')){
$_SESSION['login'] = true;
header("Location: http://localhost");
}
}
?>
</body>
</html>
Example 4: php login form
<?php
define('DB_SERVER', 'localhost:3036');
define('DB_USERNAME', 'root');
define('DB_PASSWORD', 'rootpassword');
define('DB_DATABASE', 'database');
$db = mysqli_connect(DB_SERVER,DB_USERNAME,DB_PASSWORD,DB_DATABASE);
?>
Example 5: php login
/* na primeira linha usaremos o “action=ope.php” para que o formulário repasse
as informações para a página ope.php */
<form method="post" action="ope.php" id="formlogin" name="formlogin" >
<fieldset id="fie">
<legend>LOGIN</legend><br />
<label>NOME : </label>
// o campo “name” dentro do input e importante,
// pois será ele que armazenará os dados digitados .
<input type="text" name="login" id="login" /><br />
<label>SENHA :</label>
<input type="password" name="senha" id="senha" /><br />
<input type="submit" value="LOGAR " />
</fieldset>
</form>