What are the common error levels in PHP?

php Common error levels: 1. E_ERROR; 2. E_WARNING; 3. E_PARSE; 4. E_NOTICE; 5. E_USER_ERROR; 6. E_USER_WARNING; 7. E_USER_NOTICE; 8. E_STRICT; 9. E_ALL.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

The error levels in php are:

##4 (integer)##32##64##128##E_COMPILE_WARNINGinteger(integer##512##1024##E_RECOVERABLE_ERROR() since PHP 5.2.0##E_DEPRECATEDRuntime notification. When enabled, a warning will be given about code that may not work properly in future versions.##16384 User generated warning message. Similar to since PHP 5.3.0

1	E_ERROR (integer)	Fatal runtime error. This type of error is generally an unrecoverable situation, such as a problem caused by memory allocation. The consequence is that the script terminates and does not continue to run.
##2	##E_WARNING (integer)Run-time warning (non-fatal error). Only a prompt message is given, but the script does not terminate.
##E_PARSE	(integer)Compile-time syntax parsing error. Parsing errors are generated only by the parser.		##8
##E_NOTICE	Runtime notification. Indicates that the script encounters a situation that may appear as an error, but there may also be similar notifications in scripts that can run normally.
16	E_CORE_ERROR(integer)	Initialize in PHP A fatal error occurred during startup. This error is similar to E_ERROR, but is generated by the PHP engine core.	since PHP 4
	##E_CORE_WARNING(integer) Warning (non-fatal error) that occurred during PHP initialization startup. Similar to	E_WARNING, but generated by the PHP engine core. since PHP 4
##E_COMPILE_ERROR	(integer) Fatal compile-time error. Similar to E_ERROR	, but generated by the Zend script engine. since PHP 4
(	) Compile-time warning (non-fatal error). Similar to E_WARNING, but generated by the Zend script engine.	since PHP 4##256	##E_USER_ERROR
)	Error messages generated by users. Similar to E_ERROR, but it is generated by the user using the PHP function trigger_error() in the code.	since PHP 4
	##E_USER_WARNING(integer) Warning messages generated by users. Similar to	E_WARNING, but it is generated by the user using the PHP function trigger_error() in the code. since PHP 4
##E_USER_NOTICE	(integer) Notification information generated by users. Similar to E_NOTICE	, but it is generated by the user using the PHP function trigger_error() in the code. since PHP 4	##2048
E_STRICT	(integer)Enable PHP's suggestions for code modifications to ensure the best interoperability and forward compatibility of the code. since PHP 5	##4096
integer	Fatal errors that can be caught. It indicates that a potentially dangerous error has occurred, but has not caused the PHP engine to become unstable. If the error is not caught by a user-defined handler, it will become an E_ERROR and the script will terminate.	##8192
(integer)	since PHP 5.3.0
	E_USER_DEPRECATED(integer)	E_DEPRECATED, but it is generated by the user using the PHP function trigger_error() in the code.
30719	##E_ALL (integer)	E_STRICTAll error and warning messages that go out. 30719 in PHP 5.3.x, 6143 in PHP 5.2.x, 2047 previously

php common error level:

• E_ERROR

  : Fatal runtime error (it prevents the execution of the script)

• E_WARNING

  : Runtime warning (non-fatal error)

##E_PARSE
• : Parse error
  ##E_NOTICE
: Note (things may or may not be a problem)

• E_USER_ERROR
: User generated error message, generated by the trigger_error() function

• E_USER_WARNING
: User-generated warning, generated by the trigger_error() function

• E_USER_NOTICE
: User-generated note , generated by the trigger_error() function

• E_STRICT
: Recommendations on compatibility and interoperability

• E_ALL
: All errors, warnings and suggestions

• How to set the error reporting level:

1. Modify the PHP configuration File php.iniAfter setting error_reporting in this way, restart the web server and it will take effect permanently.

Open the configuration file php.ini and check the default value of error reporting level error_reporting, as follows:

error_reporting=E_ALL & ~E_DEPRECATED & ~E_STRICT1.

It means to report all errors, except E_DEPRECATED and E_STRICT.

Modify it to:

error_reporting=E_ALL &  ~E_NOTICE1.

It means reporting all errors except E_NOTICE. This is also the most commonly used error reporting level. It will not report errors of the attention class (such as using an undefined variable).

Save and take effect after restarting the web server.

2. Use the error_reporting() function

After setting in this way, it can take effect immediately. But only in the area behind the error_reporting() function call in the current script.

int error_reporting ([ int $level ] )1.

The parameter can be an integer or the corresponding constant identifier. It is recommended to use the constant form. The return value is the value (integer value) of the error reporting level in effect at the current location.

Note: The default value of display_errors in the configuration file php.ini is On, which means error prompts are displayed. If set to Off, all error prompts will be turned off.

Use error_reporting(0) or add @ in front of the function to suppress error output to prevent error messages from leaking sensitive information.

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