modify $post if there are values submitted in certain fields

// http://www.gravityhelp.com/forums/topic/if-statement-in-content-template
// conditionally modify the post body if there is a document uploaded or a URL submitted
// if there is a document uploaded in $entry[6], then link to it with the text "Additional Information"
// if there is a URL submitted in $entry[5], then link the text to the external website
add_action('gform_after_submission_1', 'conditional_content_template_one', 10, 2);
function conditional_content_template_one($entry, $form){
        $post = get_post($entry['post_id']);
        // if either field 6 or field 5 has a value, then add the "additional information" header
        if(($entry[6]) <> '' || ($entry[5] <> '')) {
                $post->post_content = "$post->post_content\n<h4>Additional Information</h4> ";
                // field 6 == document upload
                if($entry[6] <> '') {
                        $post->post_content = "$post->post_content\n<a href='$entry[6]' title='Additional documentation for $entry[1]'>Uploaded documentation</a><br class='clear' />";
                }
                // field 5 == URL
                if($entry[5] <> '') {
                        $post->post_content = "$post->post_content\n<a target='_blank' href='$entry[5]' title='Visit external website for $entry[1]'>$entry[5]</a><br class='clear' />";
                }
        wp_update_post($post);
        }
}