Código:
Este es el del CAPTCHA. Lo probé en otro formulario más sencillo y me funcionó bien<?php
// Insert the page header
$page_title = 'Sign Up';
require_once('header.php');
require_once('appvars.php');
require_once('connectvars.php');
// Connect to the database
$dbc = mysqli_connect(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
if (isset($_POST['submit'])) {
// Grab the profile data from the POST
$username = mysqli_real_escape_string($dbc, trim($_POST['username']));
$password1 = mysqli_real_escape_string($dbc, trim($_POST['password1']));
$password2 = mysqli_real_escape_string($dbc, trim($_POST['password2']));
$mail = mysqli_real_escape_string($dbc, trim($_POST['mail']));
// Check the CAPTCHA pass-phrase for verification
$user_pass_phrase = sha1($_POST['verify']);
if ($_SESSION['pass_phrase'] == $user_pass_phrase) {
if (!empty($username) && !empty($password1) && !empty($password2) && ($password1 == $password2) && !empty($mail)){
// Make sure someone isn't already registered using this username
$query = "SELECT * FROM mismatch_user WHERE username = '$username'";
$data = mysqli_query($dbc, $query);
if (mysqli_num_rows($data) == 0) {
// The username is unique, so insert the data into the database
$query = "INSERT INTO mismatch_user (username, password, mail, join_date) VALUES ('$username', SHA('$password1'), '$mail', NOW())";
mysqli_query($dbc, $query);
// Confirm success with the user
echo '<p>Your new account has been successfully created. You\'re now ready to <a href="login.php">log in</a>.</p>';
mysqli_close($dbc);
exit();
}
else {
// An account already exists for this username, so display an error message
echo '<p class="error">An account already exists for this username. Please use a different address.</p>';
$username = "";
}
}
else {
echo '<p class="error">You must enter all of the sign-up data, including the desired password twice.</p>';
}
}
else {
echo '<p class="error">Please enter the verification pass-phrase exactly as shown.</p>';
}
}
mysqli_close($dbc);
?>
<p>Please enter your username and desired password to sign up to Mismatch.</p>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
<fieldset>
<legend>Registration Info</legend>
<label for="username">Username:</label>
<input type="text" id="username" name="username" value="<?php if (!empty($username)) echo $username; ?>" /><br />
<label for="password1">Password:</label>
<input type="password" id="password1" name="password1" /><br />
<label for="password2">Password (retype):</label>
<input type="password" id="password2" name="password2" /><br />
<label for="mail">Mail:</label>
<input type="mail" id="mail" name="mail" /><br />
<label for="verify">Verification:</label>
<input type="text" id="verify" name="verify" value="Enter the pass-phrase." /> <img src="captcha.php" alt="Verification pass-phrase" />
</fieldset>
<input type="submit" value="Sign Up" name="submit" />
</form>
<?php
// Insert the page footer
require_once('footer.php');
?>
Código:
<?php
session_start();
// Set some important CAPTCHA constants
define('CAPTCHA_NUMCHARS', 6); // number of characters in pass-phrase
define('CAPTCHA_WIDTH', 100); // width of image
define('CAPTCHA_HEIGHT', 25); // height of image
// Generate the random pass-phrase
$pass_phrase = "";
for ($i = 0; $i < CAPTCHA_NUMCHARS; $i++) {
$pass_phrase .= chr(rand(97, 122));
}
// Store the encrypted pass-phrase in a session variable
$_SESSION['pass_phrase'] = sha1($pass_phrase);
// Create the image
$img = imagecreatetruecolor(CAPTCHA_WIDTH, CAPTCHA_HEIGHT);
// Set a white background with black text and gray graphics
$bg_color = imagecolorallocate($img, 255, 255, 255); // white
$text_color = imagecolorallocate($img, 0, 0, 0); // black
$graphic_color = imagecolorallocate($img, 64, 64, 64); // dark gray
// Fill the background
imagefilledrectangle($img, 0, 0, CAPTCHA_WIDTH, CAPTCHA_HEIGHT, $bg_color);
// Draw some random lines
for ($i = 0; $i < 5; $i++) {
imageline($img, 0, rand() % CAPTCHA_HEIGHT, CAPTCHA_WIDTH, rand() % CAPTCHA_HEIGHT, $graphic_color);
}
// Sprinkle in some random dots
for ($i = 0; $i < 50; $i++) {
imagesetpixel($img, rand() % CAPTCHA_WIDTH, rand() % CAPTCHA_HEIGHT, $graphic_color);
}
// Draw the pass-phrase string
imagettftext($img, 18, 0, 5, CAPTCHA_HEIGHT - 5, $text_color, 'Courier New Bold.ttf', $pass_phrase);
// Output the image as a PNG using a header
header("Content-type: image/png");
imagepng($img);
// Clean up
imagedestroy($img);
?>
