View file sys/inc/functions/user_collision.php

<?php 

function user_collision($massive, $im = 0)
{
  	global $user;
  	$new = false;

    for ($i = 0; $i < count($massive); $i++) {
        $collision_q = db::query("SELECT * FROM `user_collision` WHERE `id_user` = '" . $massive[$i] . "' OR `id_user2` = '" . $massive[$i] . "'");

        while ($collision = $collision_q->fetch_assoc()) {
            if ($collision['id_user'] == $massive[$i])
                $coll = $collision['id_user2'];
            else 
                $coll = $collision['id_user'];

            $ank_coll2 = get_user($coll);

            if (!in_array ($coll, $massive) && ($user['level'] > $ank_coll2['level']) && ($im == 0 || $user['id'] != $ank_coll2['id'])) {
                $massive[] = $coll;
                $new = true;
            }
        }
    }

  	if ($new)
  		$massive = user_collision($massive);

  	return $massive;
}