create a login index page
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<title>Login</title>
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<link rel="stylesheet" href="css/loginstyle.css" />
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</head>
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<body>
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<?php
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require('db.php');
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session_start();
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// If form submitted, insert values into the database.
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if (isset($_POST['username'])){
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// removes backslashes
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$username = stripslashes($_REQUEST['username']);
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//escapes special characters in a string
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$username = mysqli_real_escape_string($con,$username);
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$password = stripslashes($_REQUEST['password']);
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$password = mysqli_real_escape_string($con,$password);
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//Checking is user existing in the database or not
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$query = "SELECT * FROM `users` WHERE username='$username'
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and password='".md5($password)."'";
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$result = mysqli_query($con,$query) or die(mysql_error());
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$rows = mysqli_num_rows($result);
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if($rows==1){
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$_SESSION['username'] = $username;
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// Redirect user to index.php
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header("Location: home.php");
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}else{
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echo "<div class='form'>
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<h3>Username/password is incorrect.</h3>
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<br/>Click here to <a href='db/login.php'>Login</a></div>";
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}
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}else{
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?>
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<div class="form">
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<h1>Log In</h1>
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<form action="" method="post" name="login">
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<input type="text" name="username" placeholder="Username" required />
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<input type="password" name="password" placeholder="Password" required />
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<input name="submit" type="submit" value="Login" />
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</form>
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<p>Not registered yet? <a href='registrationindex.php'>Register Here</a></p>
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</div>
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<?php } ?>
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</body>
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</html>
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