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Displaying error messages based on form data in php
<body>
<script type="text/javascript"> <!-- put the jquery load stuff into here -->
$(function(){
  $("#registration_form").load("views/register_form.php");});
</script>


<div class="topbar"><!-- Create the top bar layout-->
  <div class="fill">
    <div class="container">
     <a class="brand" href="#">Website!</a>
     <ul class="nav">
       <li class="active"><a href="#">Home</a></li>
       <li> <a href="#about">About</a></li>
     </ul>
     <form action="scripts/login_user.php" method="post" class="pull-right">
       <input class="input-medium" id="login-email" type="text" name="email_addr"     placeholder="email" />
   <input class="input-medium" id="login-password" type="password" name="password" placeholder="password" />
   <button class="btn" type="submit">Login now!</button>
     </form>
    </div>
  </div>
</div>
<div class="container">
  <div class="content">
    <div class="page header">
     Page header!
    </div>
    <div id="registration_form">
</div>

if(//some of the data in the form isn't set)
         {
           //Set error conditions based on missing data
         }

    $confirm_password=$_REQUEST['confirm_password'];
    $password=$_REQUEST['password'];
    if($confirm_password != $password){
       //report passwords don't match}


    $email_addr=$_REQUEST['email_addr'];
    $first_name=$_REQUEST['first_name'];
    $last_name=$_REQUEST['last_name'];


try
{
    $successful_creation=create_user_and_send_verification_email($email_addr, $password, $first_name, $last_name);
}
catch(Exception $e)
{
    /*SQL errors are caught here*/
}

if($successful_creation==FALSE)
{
    //If it couldn't be inserted for a non exception generating reason.  If I get here, should I echo a page that has those errors printed, but is otherwise identical to the previous one?
}
else
{
    //redirect to a "wait for a verification email" page
}