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Posted By

limonn on 10/04/06


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login

Published in: PHP 

URL: http://www.evolt.org/php_login_script_with_remember_me_feature

login with forgot

Plain TextExpand 
  1. <?
  2. session_start(); 
  3. include("database.php");
  4.  
  5. /**
  6.  * Returns true if the username has been taken
  7.  * by another user, false otherwise.
  8.  */
  9. function usernameTaken($username){
  10.    global $conn;
  11.    if(!get_magic_quotes_gpc()){
  12.       $username = addslashes($username);
  13.    }
  14.    $q = "select username from users where username = '$username'";
  15.    $result = mysql_query($q,$conn);
  16.    return (mysql_numrows($result) > 0);
  17. }
  18.  
  19. /**
  20.  * Inserts the given (username, password) pair
  21.  * into the database. Returns true on success,
  22.  * false otherwise.
  23.  */
  24. function addNewUser($username, $password){
  25.    global $conn;
  26.    $q = "INSERT INTO users VALUES ('$username', '$password')";
  27.    return mysql_query($q,$conn);
  28. }
  29.  
  30. /**
  31.  * Displays the appropriate message to the user
  32.  * after the registration attempt. It displays a 
  33.  * success or failure status depending on a
  34.  * session variable set during registration.
  35.  */
  36. function displayStatus(){
  37.    $uname = $_SESSION['reguname'];
  38.    if($_SESSION['regresult']){
  39. ?>
  40.  
  41. <h1>Registered!</h1>
  42. <p>Thank you <b><? echo $uname; ?></b>, your information has been added to the database, you may now <a href="main.php" title="Login">log in</a>.</p>
  43.  
  44. <?
  45.    }
  46.    else{
  47. ?>
  48.  
  49. <h1>Registration Failed</h1>
  50. <p>We're sorry, but an error has occurred and your registration for the username <b><? echo $uname; ?></b>, could not be completed.<br>
  51. Please try again at a later time.</p>
  52.  
  53. <?
  54.    }
  55.    unset($_SESSION['reguname']);
  56.    unset($_SESSION['registered']);
  57.    unset($_SESSION['regresult']);
  58. }
  59.  
  60. if(isset($_SESSION['registered'])){
  61. /**
  62.  * This is the page that will be displayed after the
  63.  * registration has been attempted.
  64.  */
  65. ?>
  66.  
  67. <html>
  68. <title>Registration Page</title>
  69. <body>
  70.  
  71. <? displayStatus(); ?>
  72.  
  73. </body>
  74. </html>
  75.  
  76. <?
  77.    return;
  78. }
  79.  
  80. /**
  81.  * Determines whether or not to show to sign-up form
  82.  * based on whether the form has been submitted, if it
  83.  * has, check the database for consistency and create
  84.  * the new account.
  85.  */
  86. if(isset($_POST['subjoin'])){
  87.    /* Make sure all fields were entered */
  88.    if(!$_POST['user'] || !$_POST['pass']){
  89.       die('You didn\'t fill in a required field.');
  90.    }
  91.  
  92.    /* Spruce up username, check length */
  93.    $_POST['user'] = trim($_POST['user']);
  94.    if(strlen($_POST['user']) > 30){
  95.       die("Sorry, the username is longer than 30 characters, please shorten it.");
  96.    }
  97.  
  98.    /* Check if username is already in use */
  99.    if(usernameTaken($_POST['user'])){
  100.       $use = $_POST['user'];
  101.       die("Sorry, the username: <strong>$use</strong> is already taken, please pick another one.");
  102.    }
  103.  
  104.    /* Add the new account to the database */
  105.    $md5pass = md5($_POST['pass']);
  106.    $_SESSION['reguname'] = $_POST['user'];
  107.    $_SESSION['regresult'] = addNewUser($_POST['user'], $md5pass);
  108.    $_SESSION['registered'] = true;
  109.    echo "<meta http-equiv=\"Refresh\" content=\"0;url=$HTTP_SERVER_VARS[PHP_SELF]\">";
  110.    return;
  111. }
  112. else{
  113. /**
  114.  * This is the page with the sign-up form, the names
  115.  * of the input fields are important and should not
  116.  * be changed.
  117.  */
  118. ?>
  119.  
  120. <html>
  121. <title>Registration Page</title>
  122. <body>
  123. <h1>Register</h1>
  124. <form action="<? echo $HTTP_SERVER_VARS['PHP_SELF']; ?>" method="post">
  125. <table align="left" border="0" cellspacing="0" cellpadding="3">
  126. <tr><td>Username:</td><td><input type="text" name="user" maxlength="30"></td></tr>
  127. <tr><td>Password:</td><td><input type="password" name="pass" maxlength="30"></td></tr>
  128. <tr><td colspan="2" align="right"><input type="submit" name="subjoin" value="Join!"></td></tr>
  129. </table>
  130. </form>
  131. </body>
  132. </html>
  133.  
  134.  
  135. <?
  136. }
  137. ?>

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