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It used to be hard to find questions about operators and other syntax tokens.¹
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我正在浏览一些PHP代码,我看到这个"::"表示法,我不知道这意味着什么......还有什么是&在前面的呼叫

$mainframe =& JFactory::getApplication('site');
$sql="SELECT rt.member_id ,rt.commission,rt.sales,kt.store_id,kt.user_id FROM jos_report
rt JOIN jos_kingdom_tickets kt WHERE rt.member_id=kt.ticket_id";
$db =& JFactory::getDBO();

提前致谢