http://zyan.cc/index.php zh-cn http://zyan.cc/post/14/ 张宴 <net@s135.com> Thu, 02 Jun 2005 15:01:58 +0000 http://zyan.cc/post/14/ 　　例如：
　　Notice: Undefined index: delete in /home/economics/public_html/new/admin/news.php on line 22
　　Notice: Undefined variable: pagehome in /home/economics/public_html/new/admin/news.php on line 548
　　找到错误提示对应的代码行，$sort=$HTTP_GET_VARS["delete"];，代码书写没错，只不过取得的变量值是空值，因为我将许多功能集成在一个PHP文件中，在实现其它功能时才从表单给它赋值。
　　思考了一下原因，我是在Windows＋Apache2.0.52 (WINNT)＋PHP5.0.0和Windows＋IIS6.0＋PHP5.0.0环境下编写、调试网站PHP程序的，而学校的服务器是Fedora Core(Linux)＋Apache/2.0.52 (Fedora)＋PHP4.3.9，不同版本不同运行环境下的PHP兼容性不好。试着在Fedora Core的前身Red Hat Linux 9的环境下运行经济学院网站的PHP程序，也没问题。看来就是学校服务器上的那个该死的Fedora Core惹的祸了。
　　在网上寻找对策，一个解决方案是：“由于变量未定义引起的，打开php.ini，将;error_reporting = E_ALL & ~E_NOTICE前的分号去掉；如果你想关闭任何错误提示，打开php.ini，找到display_errors，设置为display_errors = Off，以后任何错误都不会提示。”但是我不可能去改学校服务器的php.ini配置吧，这个方案被我否定了。
　　看来我只好从我的程序本身下手了，把类似$sort=$HTTP_GET_VARS["delete"];的换成if(isset($HTTP_GET_VARS["delete"])){$sort=$HTTP_GET_VARS["delete"];}，作个判断，如果delete传递过来的表单值不为空，才执行后面获取表单值的语句。但在修改过程中发现，这种方法太麻烦，效果也不是很理想。突然，在PHP手册中搜索到函数error_reporting(0);官方解释是Turn off all error reporting，于是把error_reporting(0);加到PHP程序的首行，运行后果然没出现任何错误提示，终于解决了这个难题。
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