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This article mainly introduces the PHP error level setting and principle analysis. It has certain reference value. Now I share it with everyone. Friends in need can refer to it
In the PHP configuration file, php.ini has the following configuration:
; 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
In the above configuration: error_reporting
is to set the configuration level; the default is E_ALL
, which means to display all Notices. Warning, Error information (Show all errors, warnings and notices including coding standards.).
There is a detailed explanation in the PHP manual predefined constants. The following is part of the excerpt:
Example: E_ALL & ~E_NOTICE
E_ALL: 111011111111111
E_NOTICE: 1000
~E_NOTICE: 0111
E_ALL & ~E_NOTICE: 111011111110111
This is how php controls the error level through binary conversion.
Change the error_reporting in the php.ini
file to achieve the effect.
For example:
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
In a script or program, the effect can be achieved through ini_set() and error_reporting() settings.
For example:
ini_set("display_errors",1) error_reporting(E_ALL)
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