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Why can’t I modify my comment form using hook_form_alter

I have enabled comments for a custom node type.

I am trying to theme that comment form using hook_form_alter(&$form, &$form_state) (For example, I’d like to remove the label of the comment_body form field)

To do that, I use the following function:

function MYTHEME_form_comment_form_alter(&$form, &$form_state) {     $form['comment_body']['und']['#title'][0] = ''; }

However in the output the title of the form field is still there:

actual output

Here’s the markup:

enter image description here

The value of $form does not correspond to what I am used to see. Here’s a screenshot from my debugger:

enter image description here

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Why can’t I modify my comment form using hook_form_alter

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