PHP報錯等級設定與原理分析

這篇文章主要介紹了關於PHP報錯層級設定和原理分析，有著一定的參考價值，現在分享給大家，有需要的朋友可以參考一下

原理簡介

在PHP設定檔中php.ini有以下設定：

; Error Level Constants:
; E_ALL             - All errors and warnings (includes E_STRICT as of PHP 5.4.0)
; E_ERROR           - fatal run-time errors; E_RECOVERABLE_ERROR  - almost fatal run-time errors
; E_WARNING         - run-time warnings (non-fatal errors)
; E_PARSE           - compile-time parse errors
; E_NOTICE          - run-time notices (these are warnings which often result
;                     from a bug in your code, but it's possible that it was
;                     intentional (e.g., using an uninitialized variable and
;                     relying on the fact it is automatically initialized to an
;                     empty string); E_STRICT          - run-time notices, enable to have PHP suggest changes
;                     to your code which will ensure the best interoperability
;                     and forward compatibility of your code
; E_CORE_ERROR      - fatal errors that occur during PHP's initial startup
; E_CORE_WARNING    - warnings (non-fatal errors) that occur during PHP's
;                     initial startup; E_COMPILE_ERROR   - fatal compile-time errors
; E_COMPILE_WARNING - compile-time warnings (non-fatal errors)
; E_USER_ERROR      - user-generated error message
; E_USER_WARNING    - user-generated warning message
; E_USER_NOTICE     - user-generated notice message
; E_DEPRECATED      - warn about code that will not work in future versions
;                     of PHP
; E_USER_DEPRECATED - user-generated deprecation warnings;
; Common Values:
;   E_ALL (Show all errors, warnings and notices including coding standards.)
;   E_ALL & ~E_NOTICE  (Show all errors, except for notices)
;   E_ALL & ~E_NOTICE & ~E_STRICT  (Show all errors, except for notices and coding standards warnings.)
;   E_COMPILE_ERROR|E_RECOVERABLE_ERROR|E_ERROR|E_CORE_ERROR  (Show only errors)
; Default Value: E_ALL & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED
; Development Value: E_ALL
; Production Value: E_ALL & ~E_DEPRECATED & ~E_STRICT; http://php.net/error-reportingerror_reporting = E_ALL

上面設定中：error_reporting為設定組態等級；預設是E_ALL,意思顯示所有Notice, Warning,Error資訊(Show all errors, warnings and notices including coding standards.)。
在PHP手冊預先定義常數中有詳細解釋，以下為摘錄的一部分：

」範例:E_ALL & ~E_NOTICE
 E_ALL: 111011111111111
 E_NOTICE: 1000
 ~E_NOTICE: 0111
 E_ALL & ~E_NOTICE：111011111110111

php就是這樣透過二進位的轉換來控制錯誤等級的。

調整錯誤等級

全域設定

更改php.ini檔案中的error_reporting就可以達到效果。
例如：

1. error_reporting = E_ALL #输出所有错误，警告，notice信息
2. error_reporting = E_ALL & ~E_NOTICE #输出所有错误和警告信息，不输出notice信息
3. E_ALL & ~E_NOTICE & ~E_WARNING #输出所有错误信息,不输出警告，notice信息

局部設定

在腳本或程式中，透過ini_set()和error_reporting()設定可以達到效果。
例如:

ini_set("display_errors",1)
error_reporting(E_ALL)

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