本文实例讲述了thinkphp中session和cookie无效的解决方法。分享给大家供大家参考。具体分析如下:
问题描述:
在本地调试时session和cookie是用没有问题的,我是用session保存当前登录账户的信息,上传服务器之后,发现跳转之后session不复存在,为什么呢?在当前页面输出session是存在的.
遇到这个问题三天了,因为是自学没有老师可以请教,身边也没有几个是弄PHP的,所以真的是很悲剧,于是乎百度,而百度上很多人都是屁话连天,没有什么可以解决问题的,经过三天的修改终于找到了根源,原来是因为绝大多数支持thinkphp的服务器是linux系统,而我们的编程基本都还是windows,这样就会出现bom头这个问题,而PHP对于bom头不能解析,而直接拿下来了,导致session和cookie不能用.
解决方法:
什么是bom头?在utf-8编码文件中BOM在文件头部,占用三个字节,用来标示该文件属于utf-8编码,现在已经有很多软件识别bom头,但是还有些不能识别bom头,比如PHP就不能识别bom头,这也是用记事本编辑utf-8编码后执行就会出错的原因了.
去掉bom头的办法,简单的是下面两种:
1、editplus去BOM头的方法
编辑器调整为UTF8编码格式后,保存的文件前面会多出一串隐藏的字符(也即是BOM),用于编辑器识别这个文件是否是以UTF8编码.
运行Editplus,点击工具,选择首选项,选中文件,UTF-8标识选择 总是删除签名,然后对PHP文件编辑和保存后的PHP文件就是不带BOM的了.
2、ultraedit去除bom头办法
打开文件后,另存为选项的编码格式里选择(utf-8 无bom头),确定就ok了,怎么样,去掉bom头很简单吧.
再来一段议论utf8的BOM信息的,BOM是指php文件本身的存储方式为带BOM的UTF-8,普通页面的中文乱码方式一般不是由这个原因导致的.
这句话控制html输出页面的编码方式,BOM只有在WINDOWS下采用“记事本”存储为UTF-8时才会有,这个可以用WINHEX把开始的2个字节删掉.
在dreamweaver里面编码设置里面可以设置是否带BOM,一般只要php输出的不是图片(GDI Stream),BOM都不会导致问题,GDI Stream如果开头有了额外的 字符就会显示为 红叉.
希望本文所述对大家基于ThinkPHP框架的PHP程序设计有所帮助。

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