PHP error_reporting error level variable comparison table, errorreporting_PHP tutorial

PHP’s error_reporting error level variable comparison table, errorreporting

All error messages in PHP can be set using the error_reporting() function:

Its parameters can be expressed in two ways: strings and numbers, with a total of 14 levels. However, I think it seems that other numbers can be used. At first, I thought it referred to a certain error range. Later, I finally found out The rules:

Copy code The code is as follows:

error_reporting( 7 ) = error_reporting( 1+2+4)= error_reporting(E_ERROR | E_WARING | E_PARSE)

Now, I’ll summarize it as follows:

Numbers

Constant

Description

1

E_ERROR

Fatal error, script execution is interrupted, that is, something unrecognizable appears in the script

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。

Example: Error: Invalid parameters. Invalid parameter name

2

E_WARNING

Part of the code is wrong, but it does not affect the overall operation Example: Warning: require_once(E:/include/config_base.php)

4

E_PARSE

The character, variable or ending place is written incorrectly Example: Parse error: syntax error, unexpected $end in

8

E_NOTICE

General notifications, such as undefined variables, etc. Example: Notice: Undefined variable: p in E:webindex.php on line 17

16

E_CORE_ERROR

A fatal error occurred when starting the PHP process Example: None

32

E_CORE_WARNING

Warning on PHP startup (non-fatal error) Example: None

64

E_COMPILE_ERROR

Compile time fatal error Example: None

128

E_COMPILE_WARNING

Compile time warning level error Example: None

256

E_USER_ERROR

User-defined error message Example: None

512

E_USER_WARNING

User-defined warning message Example: None

1024

E_USER_NOTICE

User-defined reminder message Example: None

2047

E_ALL

All the above error messages, but excluding E_STRICT error message Example: None

2048

E_STRICT

Coding standardization warnings, allowing PHP to suggest how to modify the code to ensure optimal interoperability and forward compatibility.

The default value of error_reporting variable is E_ALL & ~E_NOTICE
During development, the best value is: E_ALL | E_STRICT

If set to: error_reporting(E_ALL | E_STRICT), it means recording all error information
It may cause a lot of error codes to appear on the website; but it should be said to be a good thing for programmers, who can optimize the code to the optimum; although some non-fatal errors do not affect the operation of the program, they will aggravate the problem of PHP Burden.

Finally, post the English version of the comparison table:

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)

php error reporting What types of error reports are there

error_reporting()
There are four types of errors and warnings in php. They are:
Usual function errors: 1
Usual warnings: 2
Analysis errors: 4
Comment (Warning to the user, this message can be ignored, but this problem may bring some problems to your code Error): 8
The four numbers after the message are the representation values ​​of the message type, and they are added up as the error reporting level. The reporting level of a province is 7 (i.e. 1+2+4), or any other combination except "Comments". This level can be changed by changing the error reporting instructions in the php3.ini file. It can also be set by changing the php3 error reporting method in the user's httpd.conf file, or at runtime using the scripting language function error_reporting()

In PHP, what does error_reporting(0) mean?

Prevent PHP from reporting typos. If it is not closed, there will be errors like this

Warning: preg_match()

It will not appear if it is closed

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