remove.php

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<?php
// Get the GUID of the user to friend
$friend_guid = get_input('friend');
$friend = get_entity($friend_guid);
$errors = false;

// Get the user
try{
    if ($friend instanceof ElggUser) {
        elgg_get_logged_in_user_entity()->removeFriend($friend_guid);
    } else {
        register_error(elgg_echo("friends:remove:failure", array($friend->name)));
        $errors = true;
    }
} catch (Exception $e) {
    register_error(elgg_echo("friends:remove:failure", array($friend->name)));
    $errors = true;
}

if (!$errors) {
    system_message(elgg_echo("friends:remove:successful", array($friend->name)));
}

// Forward back to the page you made the friend on
forward(REFERER);