please let me know what the following lines of code mean

Question

Hi,

What is mean by the following code, I found it in the comment module (drupal 6)

return theme('box', $title, drupal_get_form('comment_form', $edit, $title));

I have used this theme function before, but I had defined some themes under hook_theme(). but I didn't see any themes defined as 'box', also I found same theme 'table'

Could you please show some urls where it explains about these things

Thank you very much

Answer 1

Have you already read Drupal API Reference? There's an explanation about themes, too.

Answer 2

With the Drupal theme system you can overwrite theme functions. So if you don't like the markup that theme_box makes, you can make my_theme_box instead and Drupal will use that function instead. The thing is in order for this to work you can't call theme_box directly. If you do that you in your module your theme can't alter the output. Instead you call theme('box', ...) this will tell Drupal that's it's the box theming function you want. It will the find out which function to call based on what's available. So if your theme doesn't have my_theme_box defined theme_box will be used instead.