implode - of an array 

    $upload_name = implode('_', array('qq'));
    dpm($upload_name);

　　

如果array() 则$upload_name是空白
如果array('qq')则$upload_name是qq
如果array('q','b')则$upload_name是q-b

posted @ 2015-10-15 18:13  qqisnow2021  阅读(138)  评论(0)    收藏  举报