Adding a filter to the content only on custom post types...

[whyisjake]

So, I wrote a plugin that adds a paypal button after the content of a custom post type. Is there a way to filter the_content so that the plugin is only added on custom post types?

This is what I have now:

 function add_some_stuff($content) {
    global $shortname;
    if (get_post_type() == 'the_store' ) {
        $display = get_post_custom_values('thestore_display');
        if($display[0]){
            $item_name = the_title('', '', false);
            $shopping_url = get_permalink();
            $item_number = get_the_ID();
            $amount = get_post_custom_values('thestore_price');
            $amount = $amount[0];
            $shipping = get_post_custom_values('thestore_shipping');
            $shipping = $shipping[0];
            $shipping2 = get_post_custom_values('thestore_shipping2');
            $shipping2 = $shipping2[0];
            $business = get_option($shortname.'_paypal');
            $handling = get_post_custom_values($shortname.'_handling');
            $handling = $handling[0];
            $currency = get_post_custom_values('thestore_currency');
            $currency = $currency[0];
            
            $paypal = <<<PAYPAL
                    <form method="post" action="https://www.paypal.com/cgi-bin/webscr" target="paypal">
                    <input type="hidden" name="cmd" value="_cart">
                    <input type="hidden" name="business" value="$business">
                    <input type="hidden" name="item_name" value="$item_name">
                    <input type="hidden" name="shopping_url" value="$shopping_url">
                    <input type="hidden" name="item_number" value="$item_number">
                    <input type="hidden" name="amount" value="$amount">
                    <input type="hidden" name="currency_code" value="$currency">
                    <input type="hidden" name="shipping" value="$shipping">
                    <input type="hidden" name="shipping2" value="$shipping2">
                    <input type="hidden" name="handling_cart" value="$handling">
                    <input type="hidden" name="bn"  value="ButtonFactory.PayPal.001">
                    <input type="image" name="add" src="http://www.powersellersunite.com/buttonfactory/sc-but-01.gif">
                    </form>
PAYPAL;
            
            
            
            return $content.$paypal;
        }
    }
}
 
add_action('the_content', 'add_some_stuff'); 
  

The problem is, when there is no paypal link, none of the content shows up... Driving me crazy.

Thanks

[DD32]

> The problem is, when there is no paypal link, none of the content shows up... Driving me crazy.

You're only returning the content within the paypal if.
Add another "return $content;" before the closing brace and you'll be right.

> if (get_post_type() == 'the_store' ) {
is probably the best way to only apply to the_store post types (Assuming your use of get_post_type() is correct, I'm not sure of its args). Else just use global $post; and work off that