最近在研究CI框架，ci框架的报错级别控制文件 在根目录下的index.php中

在大约29行 附近 有个

 1 /*
 2  *---------------------------------------------------------------
 3  * APPLICATION ENVIRONMENT
 4  *---------------------------------------------------------------
 5  *
 6  * You can load different configurations depending on your
 7  * current environment. Setting the environment also influences
 8  * things like logging and error reporting.
 9  *
10  * This can be set to anything, but default usage is:
11  *
12  *     development
13  *     testing
14  *     production
15  *
16  * NOTE: If you change these, also change the error_reporting() code below
17  *
18  */
19     define('ENVIRONMENT', 'development');

ENVIRONMENT 就是来控制报错级别的，默认的有三个选项，development  testing production，由下面的语句控制

/*
 *---------------------------------------------------------------
 * ERROR REPORTING
 *---------------------------------------------------------------
 *
 * Different environments will require different levels of error reporting.
 * By default development will show errors but testing and live will hide them.
 */

if (defined('ENVIRONMENT'))
{
	switch (ENVIRONMENT)
	{
		case 'development':
			error_reporting(E_ALL);
		break;
	
		case 'testing':
		case 'production':
			error_reporting(0);
		break;

		default:
			exit('The application environment is not set correctly.');
	}
}

 自己可以根据需求进行相应更改