How to indent php delimiter in php-mode?

Question

php-mode is not indenting delimiter:

<?php
// Not indenting PHP delimiter

if (true) {
    echo 'foo';
}

How to indent delimiter?

<?php
    // Indenting PHP delimiter

    if (true) {
        echo 'foo';
    }

I tryed:

(defun my-php-indent-setup ()
  (c-set-offset 'cpp-macro '+))

(add-hook 'php-mode-hook 'my-php-indent-setup)

But does nothing, and if I do it manually C-c C-o RET cpp-macro RET + RET it doesn't exactly do what I expected. I also tryed topmost-intro instead cpp-macro, but neither do what I expected.

Answer 1

This worked for me:

(defun my-php-indent-setup ()
    (c-set-offset 'topmost-intro '+) ; Does not affect <?php (but affects ?>)
    (c-set-offset 'inclass 0))       ; Gets the inside of class{} back to normal

(add-hook 'php-mode-hook 'my-php-indent-setup)

Note that the closing tag ?> will not be indented in the same level as <?php does, for example:

<?php
    // Indenting PHP delimiter

    if (true) {
        echo 'foo';
    }

    ?>

Anyways some PHP coding standards recommend to not include ?> in pure PHP files.