login query in php code example

Example 1: 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 2: 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 3: 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>

Example 4: login.php

<?php
   ob_start();
   session_start();
?>

<?
   // error_reporting(E_ALL);
   // ini_set("display_errors", 1);
?>

<html lang = "en">
   
   <head>
      <title>Tutorialspoint.com</title>
      <link href = "css/bootstrap.min.css" rel = "stylesheet">
      
      <style>
         body {
            padding-top: 40px;
            padding-bottom: 40px;
            background-color: #ADABAB;
         }
         
         .form-signin {
            max-width: 330px;
            padding: 15px;
            margin: 0 auto;
            color: #017572;
         }
         
         .form-signin .form-signin-heading,
         .form-signin .checkbox {
            margin-bottom: 10px;
         }
         
         .form-signin .checkbox {
            font-weight: normal;
         }
         
         .form-signin .form-control {
            position: relative;
            height: auto;
            -webkit-box-sizing: border-box;
            -moz-box-sizing: border-box;
            box-sizing: border-box;
            padding: 10px;
            font-size: 16px;
         }
         
         .form-signin .form-control:focus {
            z-index: 2;
         }
         
         .form-signin input[type="email"] {
            margin-bottom: -1px;
            border-bottom-right-radius: 0;
            border-bottom-left-radius: 0;
            border-color:#017572;
         }
         
         .form-signin input[type="password"] {
            margin-bottom: 10px;
            border-top-left-radius: 0;
            border-top-right-radius: 0;
            border-color:#017572;
         }
         
         h2{
            text-align: center;
            color: #017572;
         }
      </style>
      
   </head>
	
   <body>
      
      <h2>Enter Username and Password</h2> 
      <div class = "container form-signin">
         
         <?php
            $msg = '';
            
            if (isset($_POST['login']) && !empty($_POST['username']) 
               && !empty($_POST['password'])) {
				
               if ($_POST['username'] == 'tutorialspoint' && 
                  $_POST['password'] == '1234') {
                  $_SESSION['valid'] = true;
                  $_SESSION['timeout'] = time();
                  $_SESSION['username'] = 'tutorialspoint';
                  
                  echo 'You have entered valid use name and password';
               }else {
                  $msg = 'Wrong username or password';
               }
            }
         ?>
      </div> <!-- /container -->
      
      <div class = "container">
      
         <form class = "form-signin" role = "form" 
            action = "<?php echo htmlspecialchars($_SERVER['PHP_SELF']); 
            ?>" method = "post">
            <h4 class = "form-signin-heading"><?php echo $msg; ?></h4>
            <input type = "text" class = "form-control" 
               name = "username" placeholder = "username = tutorialspoint" 
               required autofocus></br>
            <input type = "password" class = "form-control"
               name = "password" placeholder = "password = 1234" required>
            <button class = "btn btn-lg btn-primary btn-block" type = "submit" 
               name = "login">Login</button>
         </form>
			
         Click here to clean <a href = "logout.php" tite = "Logout">Session.
         
      </div> 
      
   </body>
</html>

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