如何使用php将文件对象存储到mysql数据库

I tried to store file to database: I tried this:

 <input type="hidden" name="MAX_FILE_SIZE" value="2000000">
    <div class="col-sm-3">
        <input name="userfile" type="file" id="userfile" >
    </div>

 <input type="button" class="btn btn-success col-sm-2 col-sm-offset-1"
            style="width: 10%" value="Submit" id=ctl_submit title="Submit">

I get file object by doing this:

 $('#userfile')[0].files[0]

but how to process this object in php to store into DB. My DB contains these fields : filename, filecontent, filesize, filetype. Can anyone please tell me?

After submit a form you must have a $_FILES object. Which contains all the file related information like size type etc. So you can use that.