PHP_(dol)SERVER-values.txt

PHP Reference of $_SERVER[] values: / Errors and Logging
Value	Constant	Description	Note
1	E_ERROR (int)	Fatal run-time errors. These indicate errors that can not be recovered from, such as a memory allocation problem. Execution of the script is halted.	 

2	E_WARNING (int)	Run-time warnings (non-fatal errors). Execution of the script is not halted.	 

4	E_PARSE (int)	Compile-time parse errors. Parse errors should only be generated by the parser.	 

8	E_NOTICE (int)	Run-time notices. Indicate that the script encountered something that could indicate an error, but could also happen in the normal course of running a script.	 

16	E_CORE_ERROR (int)	Fatal errors that occur during PHP's initial startup. This is like an E_ERROR, except it is generated by the core of PHP.	 

32	E_CORE_WARNING (int)	Warnings (non-fatal errors) that occur during PHP's initial startup. This is like an E_WARNING, except it is generated by the core of PHP.	 

64	E_COMPILE_ERROR (int)	Fatal compile-time errors. This is like an E_ERROR, except it is generated by the Zend Scripting Engine.	 

128	E_COMPILE_WARNING (int)	Compile-time warnings (non-fatal errors). This is like an E_WARNING, except it is generated by the Zend Scripting Engine.	 

256	E_USER_ERROR (int)	User-generated error message. This is like an E_ERROR, except it is generated in PHP code by using the PHP function trigger_error().	 

512	E_USER_WARNING (int)	User-generated warning message. This is like an E_WARNING, except it is generated in PHP code by using the PHP function trigger_error().	 

1024	E_USER_NOTICE (int)	User-generated notice message. This is like an E_NOTICE, except it is generated in PHP code by using the PHP function trigger_error().	 

2048	E_STRICT (int)	Enable to have PHP suggest changes to your code which will ensure the best interoperability and forward compatibility of your code.	 

4096	E_RECOVERABLE_ERROR (int)	Catchable fatal error. It indicates that a probably dangerous error occurred, but did not leave the Engine in an unstable state. If the error is not caught by a user defined handle (see also set_error_handler()), the application aborts as it was an E_ERROR.	 
8192	E_DEPRECATED (int)	Run-time notices. Enable this to receive warnings about code that will not work in future versions.	 

16384	E_USER_DEPRECATED (int)	User-generated warning message. This is like an E_DEPRECATED, except it is generated in PHP code by using the PHP function trigger_error().	

32767	E_ALL (int)	All errors, warnings, and notices.	 

The above values (either numerical or symbolic) are used to build up a bitmask that specifies which errors to report. You can use the bitwise operators to combine these values or mask out certain types of errors. Note that only '|', '~', '!', '^' and '&' will be understood within php.ini.