making a login system php code example

Example 1: 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 2: php login system with admin features

include('class/User.php');
$user = new User();
$message =  $user->login();

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>

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