在PHP中所有的报错信息可以用error_reporting()这个函数来设置：

它的参数有字符串和数字两种表示方法，共14个等级，但是呢，我看使用其他数字貌似也可以，起初我以为它指的是一定的报错区间，后来，终于发现了其中的规律：

现在，我将其总结如下：

数字 常量 说明 1 E_ERROR 致命错误，脚本执行中断，就是脚本中有不可识别的东西出现
举例： Error：Invalid parameters. Invalid parameter name 2 E_WARNING 部分代码出错，但不影响整体运行
举例： Warning: require_once(E:/include/config_base.php) 4 E_PARSE  字符、变量或结束的地方写规范有误
举例：  Parse error: syntax error, unexpected $end in 8   E_NOTICE 一般通知，如变量未定义等
举例：  Notice: Undefined variable: p in E:webindex.php on line 17 16  E_CORE_ERROR PHP进程在启动时，发生了致命性错误
举例：  暂无 32  E_CORE_WARNING 在PHP启动时警告(非致命性错误)
举例：  暂无 64 E_COMPILE_ERROR 编译时致命性错误
举例：  暂无 128 E_COMPILE_WARNING 编译时警告级错误
举例：  暂无 256 E_USER_ERROR  用户自定义的错误消息
举例：  暂无 512 E_USER_WARNING 用户自定义的警告消息
举例：  暂无 1024 E_USER_NOTICE  用户自定义的提醒消息
举例：  暂无 2047 E_ALL 以上所有的报错信息，但不包括E_STRICT的报错信息
举例：  暂无 2048 E_STRICT 编码标准化警告，允许PHP建议如何修改代码以确保最佳的互操作性向前兼容性。

error_reporting 变量的默认值是  E_ALL & ~E_NOTICE
开发时，最佳的值为： E_ALL | E_STRICT

如果设置为：error_reporting(E_ALL | E_STRICT)，则表示记录所有的错误信息
可能会导致网站出现一大堆的错误代码；但是对于程序员来说应该说是一件好事，可以把代码优化到最优； 一些非致命性错误虽然不影响程序的运行，但是会加重PHP的负担.

最后，晒出英文版的对照表：

1 E_ERROR Fatal run-time errors. Errors that can not be recovered from. Execution of the script is halted 2 E_WARNING Non-fatal run-time errors. Execution of the script is not halted 4 E_PARSE Compile-time parse errors. Parse errors should only be generated by the parser 8 E_NOTICE Run-time notices. The script found something that might be an error, but could also happen when running a script normally 16 E_CORE_ERROR Fatal errors at PHP startup. This is like an E_ERROR in the PHP core 32 E_CORE_WARNING Non-fatal errors at PHP startup. This is like an E_WARNING in the PHP core 64 E_COMPILE_ERROR Fatal compile-time errors. This is like an E_ERROR generated by the Zend Scripting Engine 128 E_COMPILE_WARNING Non-fatal compile-time errors. This is like an E_WARNING generated by the Zend Scripting Engine 256 E_USER_ERROR Fatal user-generated error. This is like an E_ERROR set by the programmer using the PHP function trigger_error() 512 E_USER_WARNING Non-fatal user-generated warning. This is like an E_WARNING set by the programmer using the PHP function trigger_error() 1024 E_USER_NOTICE User-generated notice. This is like an E_NOTICE set by the programmer using the PHP function trigger_error() 2048 E_STRICT Run-time notices. PHP suggest changes to your code to help interoperability and compatibility of the code 4096 E_RECOVERABLE_ERROR Catchable fatal error. This is like an E_ERROR but can be caught by a user defined handle (see also set_error_handler()) 8191 E_ALL All errors and warnings, except level E_STRICT (E_STRICT will be part of E_ALL as of PHP 6.0)