<?php
function form_post_check()
{
$referring_url = $_SERVER['HTTP_REFERER']; $host = $_SERVER['HTTP_HOST']; $valid_url = 'http://'.$host.'/'; $valid_len = strlen( $valid_url ); if ( substr( $referring_url, 0, $valid_len ) != $valid_url )
{
die( 'You submitted this form from an invalid URL.' ); }
}
?>