create page login 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: 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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