verification form

[gracekelly]

Hi, I started doing a page with a form to access to a protected file (privatehome.htm). Now I need to insert two features, but don't know how:
1) I need to verify that some text with @ has been inserted in the e-mail field
2) I need to ensured that the checkbox has been checked
the best thing should be to encounter two different error pages...
the codes are these:

• in the first splah in page:

  <form action="action.php" method="post">
  e-mail:   <input name="address"  type="text"     id="address"><br>
  password: <input name="password" type="password" id="password"><br>
  <input type="checkbox" name="privacy" value="on"> privacy agreement<br>
  <input type="submit"   name="Submit"  value="I N V I A">
  <input type="reset"    name="Submit"  value="cancella">
  </form>

• then, in the control file:

  <?php
  include('database.php');
  if(in_array($_POST['password'],$datapassword)){
  header("Location: privatehome.htm"); 
  }else{
  include('errore.htm');
  }
  ?>

• while the data are:

  <?
  $dataaddress = array(*@*.*);   ???
  $dataprivacy = array(on);           ???
  $datapassword = array(555);
  ?>

If anyone can help me, I will be very grateful!

[jignesh1]

for the email use the regualr expression
and for the checkbox use the javascript to make sure that user have selected the checkbox
u could use javascript regualr expression so that way it wont use server resources

[bradgrafelman]

jignesh1 wrote:

u could use javascript regualr expression so that way it wont use server resources

While it's true that Javascript wouldn't require the server to do anything, Javascript is a client-side language and should therefore never be used for validation methods. Period.

Using regular expresion, however, is the way to go for checking the syntax of an entered e-mail address. Now, there are numerous solutions out there. The problem lies in finding one that a) doesn't have too many (or any?) false positives, yet b) is sturdy enough to reject fake addresses. Search the board for "email regular expression" (or Google) and you'll be inundated. For a sample, here's a user-contributed note I found on the manual page for [man]preg_match/man (the function you should use to validate the address):

  function is_email($Addr) 
  {
   $p = '/^[a-z0-9!#$%&*+-=?^_`{|}~]+(\.[a-z0-9!#$%&*+-=?^_`{|}~]+)*';
   $p.= '@([-a-z0-9]+\.)+([a-z]{2,3}';
   $p.= '|info|arpa|aero|coop|name|museum)$/ix';
   return preg_match($p, $Addr);
  }

As for checking if a checkbox has been checked... well that's easy enough! If the box isn't checked, it shouldn't be submitted at all, so you can check if it has been set at all, like so:

if(!isset($_POST['checkbox_name_here'])) {
    // checkbox wasn't checked...
} else {
    // checkbox WAS checked!
}

[gracekelly]

Thank you very much, but how have I to insert the codes in mine to make them work correctly?