remove.php

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<?php
$user_guid = get_input('guid');
$user = get_user($user_guid);

if (!$user || !$user->canEdit()) {
    register_error(elgg_echo('avatar:remove:fail'));
    forward(REFERER);
}

// Delete all icons from diskspace
$icon_sizes = elgg_get_config('icon_sizes');
foreach ($icon_sizes as $name => $size_info) {
    $file = new ElggFile();
    $file->owner_guid = $user_guid;
    $file->setFilename("profile/{$user_guid}{$name}.jpg");
    $filepath = $file->getFilenameOnFilestore();
    if (!$file->delete()) {
        elgg_log("Avatar file remove failed. Remove $filepath manually, please.", 'WARNING');
    }
}

// Remove crop coords
unset($user->x1);
unset($user->x2);
unset($user->y1);
unset($user->y2);

// Remove icon
unset($user->icontime);

system_message(elgg_echo('avatar:remove:success'));
forward(REFERER);