function zh_get_invoice_round_off_number()
{
global $post;
return get_post_meta($post->ID, 'invoice_round_off_number', true);
}
function zh_invoice_round_off_number()
{
echo zh_get_invoice_round_off_number();
}
Dans la boucle :
$custom_fields = get_post_custom(the_ID());
$my_custom_field = $custom_fields['zh_invoice_round_off_number'];
convert_number((int)$my_custom_field);
Ou avec votre fonction:
$custom_value = zh_get_invoice_round_off_number();
echo convert_number( (int) $custom_value );