语法错误，Laravel中的意外' - >'（T_OBJECT_OPERATOR）

Question

In Laravel 4.2, I am getting the following error:

Symfony \ Component \ Debug \ Exception \ FatalErrorException (E_PARSE)
syntax error, unexpected '->' (T_OBJECT_OPERATOR), expecting ',' or ')' 

This error happens in class Recommendation, which provides static function getRecommendations

class Recommendation extends Eloquent {

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'recommendations';

    public static function getRecommendations($userID) {
        $recommendations = DB::table('recommendations')
            ->join('sites', function($join) use ($user->id) {
                $join->on('sites.id', '=', 'recommendations.site_id');
                $join->on('sites.owner', '=', DB::raw($userID));
            })
            ->select('recommendations.id', 'recommendations.title', 'recommendations.body', 'recommendations.site_id', 'site.address')
            ->get();
        return $recommendations;
    }

}

on this line

->join('sites', function($join) use ($user->id) {

I cannot understand, what's wrong with the query..

Structure of Recommendations table is

id  int(10) unsigned Autoincrement   
title   varchar(255)     
body    text     
site_id int(10) unsigned     
created_at  timestamp [0000-00-00 00:00:00]  
updated_at  timestamp [0000-00-00 00:00:00]

and Sites table is

id  int(10) unsigned Автоматическое приращение   
sitename    varchar(255)     
address varchar(64)  
owner   int(10) unsigned     
created_at  timestamp [0000-00-00 00:00:00]  
updated_at  timestamp [0000-00-00 00:00:00]

Answer 1

There is no variable $user available in function getRecommendations(), the function argument $userID is not used inside the function and the anonymous function uses $userID.

The only conclusion is that the line should read:

->join('sites', function($join) use ($userID) {