add.php

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<?php
// Get the GUID of the user to friend
$friend_guid = get_input('friend');
$friend = get_entity($friend_guid);
if (!$friend) {
    register_error(elgg_echo('error:missing_data'));
    forward(REFERER);
}

$errors = false;

// Get the user
try {
    if (!elgg_get_logged_in_user_entity()->addFriend($friend_guid)) {
        $errors = true;
    }
} catch (Exception $e) {
    register_error(elgg_echo("friends:add:failure", array($friend->name)));
    $errors = true;
}
if (!$errors) {
    // add to river
    elgg_create_river_item(array(
        'view' => 'river/relationship/friend/create',
        'action_type' => 'friend',
        'subject_guid' => elgg_get_logged_in_user_guid(),
        'object_guid' => $friend_guid,
    ));
    system_message(elgg_echo("friends:add:successful", array($friend->name)));
}

// Forward back to the page you friended the user on
forward(REFERER);