add.php

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<?php
// Get the GUID of the user to friend
$friend_guid = get_input('friend');
$friend = get_user($friend_guid);
 
if (!$friend) {
    register_error(elgg_echo('error:missing_data'));
    forward(REFERER);
}
 
if (!elgg_get_logged_in_user_entity()->addFriend($friend->guid, true)) {
    register_error(elgg_echo("friends:add:failure", array($friend->name)));
    forward(REFERER);
}
 
system_message(elgg_echo("friends:add:successful", array($friend->name)));
forward(REFERER);