PHP Registration Form not submitting

if ($fn && $ln && $e && $p) { // If everything's OK..                        
      } else { // If one of the data tests failed.
            echo '<p class="error">Please re-enter your passwords and try again.</p>';
      }

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<?php if (isset($_POST['submitted'])) { // Handle the form.

      require_once (MYSQL);
      
      // Trim all the incoming data:
      $trimmed = array_map('trim', $_POST);
      
      // Assume invalid values:
      $fn = $ln = $e = $p = FALSE;
      
      // Check for a first name:
      if (preg_match ('/^[A-Z \'.-]{2,20}$/i', $trimmed['first_name'])) {
            $fn = mysqli_real_escape_string ($dbc, $trimmed['first_name']);
      } else {
            echo '<p class="error">Please enter your first name!</p>';
      }
      
      // Check for a last name:
      if (preg_match ('/^[A-Z \'.-]{2,40}$/i', $trimmed['last_name'])) {
            $ln = mysqli_real_escape_string ($dbc, $trimmed['last_name']);
      } else {
            echo '<p class="error">Please enter your last name!</p>';
      }
      
      // Check for an email address:
      if (preg_match ('/^[\w.-]+@[\w.-]+\.[A-Za-z]{2,6}$/', $trimmed['email'])) {
            $e = mysqli_real_escape_string ($dbc, $trimmed['email']);
      } else {
            echo '<p class="error">Please enter a valid email address!</p>';
      }

      // Check for a password and match against the confirmed password:
      if (preg_match ('/^\w{4,20}$/', $trimmed['password1']) ) {
            if ($trimmed['password1'] == $trimmed['password2']) {
                  $p = mysqli_real_escape_string ($dbc, $trimmed['password1']);
            } else {
                  echo '<p class="error">Your password did not match the confirmed password!</p>';
            }
      } else {
            echo '<p class="error">Please enter a valid password!</p>';
      }
      
      if ($fn && $ln && $e && $p) { // If everything's OK...

            // Make sure the email address is available:
            $q = "SELECT user_id FROM users WHERE email='$e'";
            $r = mysqli_query ($dbc, $q) or trigger_error("Query: $q\n<br />MySQL Error: " . mysqli_error($dbc));
            
            if (mysqli_num_rows($r) == 0) { // Available.
            
                  // Create the activation code:
                  $a = md5(uniqid(rand(), true));
            
                  // Add the user to the database:
                  $q = "INSERT INTO users (email, pass, first_name, last_name, active, registration_date) VALUES ('$e', SHA1('$p'), '$fn', '$ln', '$a', NOW() )";
                  $r = mysqli_query ($dbc, $q) or trigger_error("Query: $q\n<br />MySQL Error: " . mysqli_error($dbc));

                  if (mysqli_affected_rows($dbc) == 1) { // If it ran OK.
                  
                        // Send the email:
                        $body = "Thank you for registering at <whatever site>. To activate your account, please click on this link:\n\n";
                        $body .= BASE_URL . 'activate.php?x=' . urlencode($e) . "&y=$a";
                        mail($trimmed['email'], 'Registration Confirmation', $body, 'From: admin@sitename.com');
                        
                        // Finish the page:
                        echo '<h3>Thank you for registering! A confirmation email has been sent to your address. Please click on the link in that email in order to activate your account.</h3>';
                        include ('includes/footer.php'); // Include the HTML footer.
                        exit(); // Stop the page.
                        
                  } else { // If it did not run OK.
                        echo '<p class="error">You could not be registered due to a system error. We apologize for any inconvenience.</p>';
                  }
                  
            } else { // The email address is not available.
                  echo '<p class="error">That email address has already been registered. If you have forgotten your password, use the link at right to have your password sent to you.</p>';
            }
            
      } else { // If one of the data tests failed.
            echo '<p class="error">Please re-enter your passwords and try again.</p>';
      }

      mysqli_close($dbc);

} // End of the main Submit conditional.
?>

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