TYPE
====
PHP event + template event

LOCATION (PHP)
==============
includes/mcp/mcp_warn.php, function mcp_warn_user_view(), immediately
before the final $template->assign_vars() call (after $user_rank_data
and $avatar_img are computed):

    $user_rank_data = phpbb_get_user_rank($user_row, $user_row['user_posts']);
    $avatar_img = phpbb_get_user_avatar($user_row);

    /**
    * Modify user data before it is assigned to the template on the MCP warn-user page
    *
    * @event core.mcp_warn_user_modify_template_vars
    * @var array    user_row        The entire user row
    * @var array    user_rank_data    Array with rank title/img for this user
    * @var string    avatar_img        Rendered avatar HTML for this user
    * @since to be filled in by the phpBB dev team at merge time
    */
    $vars = array('user_row', 'user_rank_data', 'avatar_img');
    extract($phpbb_dispatcher->trigger_event('core.mcp_warn_user_modify_template_vars', compact($vars)));

    // OK, they didn't submit a warning so lets build the page for them to do so
    $template->assign_vars(array(
        'U_POST_ACTION'        => $this->u_action,

        'RANK_TITLE'        => $user_rank_data['title'],
        ...

LOCATION (template)
====================
styles/prosilver/template/mcp_warn_user.html, immediately after the
RANK_IMG line, inside the same details list as JOINED/POSTS/WARNINGS:

    <dl class="details">
        <!-- IF RANK_TITLE --><dt>{L_RANK}

{L_COLON}</dt><dd>{RANK_TITLE}</dd><!-- ENDIF -->
        <!-- IF RANK_IMG -><dt><!- IF RANK_TITLE -> <!- ELSE -->{L_RANK}{L_COLON}

<!-- ENDIF -></dt><dd>{RANK_IMG}</dd><!- ENDIF -->
        {% EVENT mcp_warn_user_rank_after %}
        <dt>{L_JOINED}

{L_COLON}

</dt><dd>{JOINED}</dd>

PURPOSE
=======
mcp_warn.php only fires trigger_event() calls (core.mcp_warn_user_before,
core.mcp_warn_user_after) inside the branch that handles an actual
warning submission. On a normal page load - a moderator simply opening
the "warn this user" page - neither event fires, so there is no hook
between fetching $user_row and the final assign_vars() call, and the
template has no event tag anywhere near the user summary block either.

USE CASE
========
phpbbmodders/displaygroupsrank (shows extra rank images for every group
a user belongs to, alongside their normal rank) covers the profile
page, topic posts, PM view, the member list, and the team page through
existing events, but cannot cover this page at all without a new one.

VARIABLES
=========

• user_row (array, read-only) - the entire user row
• user_rank_data (array, read-only) - rank title/img for this user
• avatar_img (string, read-only) - rendered avatar HTML for this user