error_reporting() 设置 PHP 的报错级别并返回当前级别。
语法：error_reporting(report_level)
如果参数 level 未指定，当前报错级别将被返回。下面几项是 level 可能的值：
- ; 错误报告是按位的。或者将数字加起来得到想要的错误报告等级。
- ; E_ALL - 所有的错误和警告
- ; E_ERROR - 致命性运行时错
- ; E_WARNING - 运行时警告（非致命性错）
- ; E_PARSE - 编译时解析错误
- ; E_NOTICE - 运行时提醒(这些经常是是你的代码的bug引起的，
- ;也可能是有意的行为造成的。(如：基于未初始化的变量自动初始化为一个
- ;空字符串的事实而使用一个未初始化的变量)
- ; E_CORE_ERROR - 发生于PHP启动时初始化过程中的致命错误
- ; E_CORE_WARNING - 发生于PHP启动时初始化过程中的警告(非致命性错)
- ; E_COMPILE_ERROR - 编译时致命性错
- ; E_COMPILE_WARNING - 编译时警告(非致命性错)
- ; E_USER_ERROR - 用户产生的出错消息
- ; E_USER_WARNING - 用户产生的警告消息
- ; E_USER_NOTICE - 用户产生的提醒消息
任意数目的以上选项都可以用“或”来连接（用 OR 或 |），这样可以报告所有需要的各级别错误。例如，下面的代码关闭了用户自定义的错误和警告，执行了某些操作，然后恢复到原始的报错级别：
06 | error_reporting(E_ERROR | E_WARNING | E_PARSE); |
09 | error_reporting(E_ALL); |
更详细可以参照下表：
| 值 | 常量 | 描述 |
|---|
| 1 | E_ERROR | Fatal run-time errors. Errors that can not be recovered from. Execution of the script is halted 致命的运行时错误 |
| 2 | E_WARNING | Non-fatal run-time errors. Execution of the script is not halted 运行时警告(非致命性错误) |
| 4 | E_PARSE | Compile-time parse errors. Parse errors should only be generated by the parser 编译时解析错误 |
| 8 | E_NOTICE | Run-time notices. The script found something that might be an error, but could also happen when running a script normally 运行时提醒(经常是bug，也可能是有意的) |
| 16 | E_CORE_ERROR | Fatal errors at PHP startup. This is like an E_ERROR in the PHP core PHP启动时初始化过程中的致命错误 |
| 32 | E_CORE_WARNING | Non-fatal errors at PHP startup. This is like an E_WARNING in the PHP core PHP启动时初始化过程中的警告(非致命性错) |
| 64 | E_COMPILE_ERROR | Fatal compile-time errors. This is like an E_ERROR generated by the Zend Scripting Engine 编译时致命性错 |
| 128 | E_COMPILE_WARNING | Non-fatal compile-time errors. This is like an E_WARNING generated by the Zend Scripting Engine 编译时警告(非致命性错) |
| 256 | E_USER_ERROR | Fatal user-generated error. This is like an E_ERROR set by the programmer using the PHP function trigger_error() 用户自定义的致命错误 |
| 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() 用户自定义的警告(非致命性错误) |
| 1024 | E_USER_NOTICE | User-generated notice. This is like an E_NOTICE set by the programmer using the PHP function trigger_error() 用户自定义的提醒(经常是bug，也可能是有意的) |
| 2048 | E_STRICT | Run-time notices. PHP suggest changes to your code to help interoperability and compatibility of the code 编码标准化警告(建议如何修改以向前兼容) |
| 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()) 接近致命的运行时错误，若未被捕获则视同E_ERROR |
| 8191 | E_ALL | All errors and warnings, except level E_STRICT (E_STRICT will be part of E_ALL as of PHP 6.0) 除E_STRICT外的所有错误(PHP6中为8191,即包含所有) |
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