1stmay2016

I have 15 images in a post, how can I add the custom field for all images?

I don’t know why it doesn’t work for me. I used generatepress theme. I add the following code on my theme function.php file

add_filter( ‘scriptlesssocialsharing_pinterest_image_attributes’, ‘rgc_sample_pin_id’ );
/**
* Add data-pin-id to the hidden Pinterest image attributes, if the
* custom field has been manually added.
*
* @param array $attributes
* @return array
*/
function rgc_sample_pin_id( $attributes ) {
$pin_id = get_post_meta( get_the_ID(), ‘scriptless_pinterest_pinid’, true );
if ( $pin_id ) {
$attributes[‘data-pin-id’] = $pin_id;
}

return $attributes;
}

is there anything else I have to do?
Thanks for your time.