Does anyone know of a good tutorial that shows you how to make a contact form that checks to make sure all the fields have been provided and that sets the error message to a variable?

    Search this forum, I remember a few threads ...

      Not exactly a tutorial, but it is well commented.

       
  ####   RETURN EMAIL ADDRESS    ####
  if($_POST['from']==''){$log .= 'Must provide a return email address.';
  }elseif (!ereg("^[^@]{1,64}@[^@]{1,255}$", $_POST['from'])){
  $log .= 'The return email address is not a valid pattern.';
  };

  ####   FROM NAME    ####
  if($_POST['fromName']==''){$log .= 'Please provide your name.';}else{
    $name=explode(' ',$_POST['fromName']);
    if(count($name) < '2'){$log .= 'Please provide your given name <span style="text-decoration:underline;font-weight:bolder;">and</span> surname.';};
  }; 


  ####   SUBJECT   ####
  if(trim($_POST['subject'])==''){
    $log .= 'No subject.';
  };
  if(trim(strlen($_POST['subject']))>255){
    $log .= 'Subject exceeds maximum length of 255 characters. Please use the form provided.';
  };
  ####    CONTENT    ####
  if(trim($_POST['content'])==''){$log .= 'No content!';};
  $length = strlen($_POST['content']);
  if($length>4000){$log .= 'Your content is too long: '.$length.' characters!!';};    

  ####    MULTIPLE SUBMISSIONS   ####
  if(!prevent_multi_submit('mailForm','')){
    $log.='You cannot submit the same form twice!';
  }

        . . . and to prevent multiple submissions, have this function on the global scope:

        

function prevent_multi_submit($name,$excl = "validator") {
$string = "";
foreach ($_POST as $key => $val) {
    // this test is new in version 1.01 to exclude a single variable
    if ($key != $excl) {
        $string .= $val;
    }
};
$i='0';
while(isset($_SESSION[$name.$i])){
    if ($_SESSION[$name.$i] === md5($string)) {
        return false;
    } else {
        $i++;
    };
};//end while

    $_SESSION[$name.$i] = md5($string);
    return true;
}

          Finally, if there were errors while checking, you need to display those errors and return the form.

          if($log!=''){

  $content = '<div class="error">There were some errors: 
  '.$log.'
  </div>
'.$form;
}else{
  $content=$form;
};

$pageBuilder->addContent($content);
echo $pageBuilder->assemble();

          Remember to initialise $content=''; at the start of the script, if register_globals=1 in php.ini

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