PHP setcookie无效的原因分析
在PHP开发中，有时候你在本地开发测试过程中是正常的，但是上传到服务器环境时候便运行不正常了，最近遇到了这样一个问题，本地PHP开发环境中setcookie正常，在服务器中setcookie无效。仔细研究了研究，总结了一下 php setcookie 无效大概有以下三种原因。
一、程序文件存在 BOM 代码
对于这种情况，只需将源代码拷贝出来，然后新建一个文件保存进去即可。
至于如何查询文件是否存在 bom 代码，可参考本站文章：php bom去除工具,php批量去除bom的代码
二、检查PHP.ini里面相关cookie的设置
配置相关可以网络上面搜索。
三、php代码中使用了header()函数，且在 header 前面存在空格或者换行
header()函数发送一段文件头给浏览器，但是如果在使用这个函数之前已经有了任何输出（包括空输出，比如空格，回车和换行）就会提示出错。一般的情况下，清除掉前面的空格就可以了。但如果还是不行，你可以按如下操作：在页面顶部加上：
ob_start();//控制您的浏览器cache，加在setcookie代码之前，一般加在页面顶部
ob_get_clean();//输出浏览器cache，看看结果是否存在cookie，加在setcookie代码之后，一般加在页面最后
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