php login page code example

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: simple login form in php

<?php
session_start();
$errorMsg = "";
$validUser = $_SESSION["login"] === true;
if(isset($_POST["sub"])) {
  $validUser = $_POST["username"] == "admin" && $_POST["password"] == "password";
  if(!$validUser) $errorMsg = "Invalid username or password.";
  else $_SESSION["login"] = true;
}
if($validUser) {
   header("Location: /login-success.php"); die();
}
?>
<!DOCTYPE html>
<html>
<head>
  <meta http-equiv="content-type" content="text/html;charset=utf-8" />
  <title>Login</title>
</head>
<body>
  <form name="input" action="" method="post">
    <label for="username">Username:</label><input type="text" value="<?= $_POST["username"] ?>" id="username" name="username" />
    <label for="password">Password:</label><input type="password" value="" id="password" name="password" />
    <div class="error"><?= $errorMsg ?></div>
    <input type="submit" value="Home" name="sub" />
  </form>
</body>
</html>

Example 3: 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 4: html login scripts

<form action="action_page.php" method="post">
  <div class="imgcontainer">
    <img src="img_avatar2.png" alt="Avatar" class="avatar">
  </div>

  <div class="container">
    <label for="uname"><b>Username</b></label>
    <input type="text" placeholder="Enter Username" name="uname" required>

    <label for="psw"><b>Password</b></label>
    <input type="password" placeholder="Enter Password" name="psw" required>

    <button type="submit">Login</button>
    <label>
      <input type="checkbox" checked="checked" name="remember"> Remember me
    </label>
  </div>

  <div class="container" style="background-color:#f1f1f1">
    <button type="button" class="cancelbtn">Cancel</button>
    <span class="psw">Forgot <a href="#">password?</a></span>
  </div>
</form>

Example 5: 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 6: 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);
?>

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