PHP的error_reporting錯誤級別變量對照表

在PHP中所有的報錯信息可以用error_reporting()這個函數來設置：

它的參數有字符串和數字兩種表示方法，共14個等級，但是呢，我看使用其他數字貌似也可以，起初我以為它指的是一定的報錯區間，後來，終於發現了其中的規律：
復制代碼 代碼如下:error_reporting( 7 ) = error_reporting( 1+2+4)= error_reporting(E_ERROR | E_WARING | E_PARSE)

現在，我將其總結如下：

數字 常量 說明 1 E_ERROR 致命錯誤，腳本執行中斷，就是腳本中有不可識別的東西出現
舉例： Error：Invalid parameters. Invalid parameter name 2 E_WARNING 部分代碼出錯，但不影響整體運行
舉例： Warning: require_once(E:/include/config_base.php) 4 E_PARSE  字符、變量或結束的地方寫規范有誤
舉例：  Parse error: syntax error, unexpected $end in 8   E_NOTICE 一般通知，如變量未定義等
舉例：  Notice: Undefined variable: p in E:\web\index.php on line 17 16  E_CORE_ERROR PHP進程在啟動時，發生了致命性錯誤
舉例：  暫無 32  E_CORE_WARNING 在PHP啟動時警告(非致命性錯誤)
舉例：  暫無 64 E_COMPILE_ERROR 編譯時致命性錯誤
舉例：  暫無 128 E_COMPILE_WARNING 編譯時警告級錯誤
舉例：  暫無 256 E_USER_ERROR  用戶自定義的錯誤消息
舉例：  暫無 512 E_USER_WARNING 用戶自定義的警告消息
舉例：  暫無 1024 E_USER_NOTICE  用戶自定義的提醒消息
舉例：  暫無 2047 E_ALL 以上所有的報錯信息，但不包括E_STRICT的報錯信息
舉例：  暫無 2048 E_STRICT 編碼標准化警告，允許PHP建議如何修改代碼以確保最佳的互操作性向前兼容性。

error_reporting 變量的默認值是  E_ALL & ~E_NOTICE
開發時，最佳的值為： E_ALL | E_STRICT

如果設置為：error_reporting(E_ALL | E_STRICT)，則表示記錄所有的錯誤信息
可能會導致網站出現一大堆的錯誤代碼；但是對於程序員來說應該說是一件好事，可以把代碼優化到最優； 一些非致命性錯誤雖然不影響程序的運行，但是會加重PHP的負擔.

最後，曬出英文版的對照表：

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)