让CI显示PHP错误
刚开始学习CI，发现有时候程序出错并时没有报告错误，而是显示一个空白页面，调试起来比较头疼。
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想让它显示错误的话，在入口文件index.php中添加这行代码就好了
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ini_set('display_errors',1);
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