Shortcode not accepting atts

Question

i have been working on a shortcode and I am having trouble passing $atts to it.

i can't figure out what i am doing wrong.

To say it another way, i cannot update 'input_product_image_ID' to a different value from it's default value of 13 by inserting a new value into the shortcode.

for example this shortcode would still return 13, not 12:

[product_picture input_product_image_ID="12"]

My code:

function article_image_insert_shortcode($atts) {
   extract(shortcode_atts(array(
      'input_product_image_ID' => 13,
   ), $atts));


$product_id = $input_product_image_ID;


// get product page url which is stored as caption 
$product_page_url           = get_post_field('post_excerpt', $product_id );

// get and insert image 
$product_image              = wp_get_attachment_image( $product_id , full_size );

// get image alt text which serves as the image title 
$product_description_alt    = get_post_meta($product_id , '_wp_attachment_image_alt', true);


// get image caption where link is stored


$thumb_img = get_post( get_post($product_id) );

// assign caption 

$product_aff_url            = $thumb_img->post_content;


$article_image_insert_shortcode = /* do some stuff */;

return $article_image_insert_shortcode;


}

add_shortcode('product_picture', 'article_image_insert_shortcode');

Answer 1

To add to the answers in the comments from RH, I found this in the codex (it's kind of burried deep):

• Shortcode attribute names are always converted to lowercase before they are passed into the handler function. Values are untouched.

This is from: http://codex.wordpress.org/Function_Reference/add_shortcode#Parameters