How to configure error log in php.ini

How to configure the error log in php.ini: 1. Open the php.ini configuration file and modify "display_errors = On"; 2. Record to the file specified by error_log; 3. Set "error_reporting".

The operating environment of this article: Windows7 system, PHP7.1 version, DELL G3 computer

How to configure php.ini Error log?

php.ini configuration--record PHP error log

Configuration items for error log in PHP.ini:

; display_errors
; Default Value: On
; Development Value: On
; Production Value: Off
; display_startup_errors
; Default Value: Off
; Development Value: On
; Production Value: Off
; error_reporting
; Default Value: E_ALL & ~E_NOTICE
; Development Value: E_ALL | E_STRICT
; Production Value: E_ALL & ~E_DEPRECATED
; html_errors
; Default Value: On
; Development Value: On
; Production value: Off
; log_errors
; Default Value: Off
; Development Value: On
; Production Value: On

display_errors = Off

error_reporting = E_ALL & ~E_NOTICE

log_errors = On

error_log = "e:/wamp/logs/php_error.log"

##1.) display_errors = On
In the open state, if an error occurs, an error will be reported and an error message will appear
dispaly_errors = Off
In the closed state, if an error occurs error, it will prompt: Server error. But no error message will appear

Error echo is commonly used in development mode, but many applications forget to turn off this option in the formal environment. Error echo can expose a lot of sensitive information, which facilitates the attacker's next attack. It is recommended to turn off this option after going online.
2.) log_errors
Just use this in a formal environment and record the error information in the log. Just in time to turn off error echo.

The default is to record to the log file of the WEB server, such as Apache's error.log file. Of course, you can also record to the file specified by error_log .

3）error_reporting

##error_reporting = E_ALL & ~E_NOTICE

## Reference: http://hi.baidu.com/allense7en /item/6eb4a4ab0d596a15a8cfb7b4

You can add up the numbers to get the desired error reporting level.

E_ALL - All errors and warnings (excluding E_STRICT) E_ERROR - Fatal runtime errors

E_WARNING - Runtime warnings (non-fatal errors)

E_PARSE - Compile time parsing errors E_NOTICE - Runtime reminders (these are often caused by bugs in your code, or may be caused by intentional behavior.)
E_STRICT - Encoding standardization warnings, allowing PHP suggestions How to modify code to ensure optimal interoperability and forward compatibility.



E_CORE_ERROR - Fatal error during PHP startup initialization E_CORE_WARNING - Warning (non-fatal error) during PHP startup initialization

E_COMPILE_ERROR - Fatal at compile time Sexual error

E_COMPILE_WARNING - compile-time warning (non-fatal error) E_USER_ERROR - user-defined error message
E_USER_WARNING - user-defined warning message
E_USER_NOTICE - user-defined reminder message if Set to: E_ALL | E_STRICT, which means recording all error messages



, which may cause a lot of error codes to appear on the website; but for programmers, it should be said that it is a A good thing, you can optimize the code to the best; some non-fatal errors do not affect the operation of the program, but they will increase the burden on PHP, usually increasing the website process (such as

IIS application pool) burden.

This function is used to configure the level of error message reporting. The parameter level is an integer bitmask, see the table below.

The mask value represents the name
1 E_ERROR
2 E_WARNING
4 E_PARSE
8 E_NOTICE
16 E_CORE_ERROR
32 E_CORE_WARNING
64 E_COMPILE_ERROR
128 E_COMPILE_WARNING
256 E_USER_ERROR
512 E_USER_WARNING
1024 E_USER_NOTICE
2047 E_ALL
2048 E_STRICT

E_NOTICE means that the normal situation is not recorded, and is only used when the program has an error situation, such as trying to access a non-existent variable, or calling the stat() function to view a non-existent file.
E_WARNING is usually displayed, but does not interrupt program execution. This is useful for debugging. For example: calling ereg() with the regular expression in question.
E_ERROR is usually displayed and will interrupt program execution. This means that memory configuration or other errors cannot be traced using this mask.
E_PARSE parses errors from the grammar.
E_CORE_ERROR Similar to E_ERROR, but does not include errors caused by the PHP core.
E_CORE_WARNING Similar to E_WARNING, but does not include PHP core error warnings.
error_reporting( 7 ) = error_reporting( 1 2 4) = error_reporting(E_ERROR | E_WARING | E_PARSE)

##Example

Any number of the above options can be connected with "OR" (using OR or |), so that all required levels of errors can be reported. For example, the following code turns off user-defined errors and warnings, performs certain operations, and then returns to the original error level:

<?php //禁用错误报告
error_reporting(0);

//报告运行时错误
error_reporting(E_ERROR | E_WARNING | E_PARSE);

//报告所有错误
error_reporting(E_ALL);
?>

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