E_ALL ^ E_NOTICE - error_reporting

PHP has many levels of errors.

E_ALL ^ E_NOTICE is the default error level set in the php.in file.

It simply mean, "Report all errors except E_NOTICE".

error_reporting(E_ALL ^ E_NOTICE);

If you just want to apply some specific level of errors, you can use following as option.

error_reporting(E_ERROR | E_WARNING | E_PARSE);

Here we are telling PHP to show only errors related to E_ERROR, E_WARNING and E_PARSE. Rest of the error types will be ignored.

If you want to turn off all types of error reporting,

error_reporting(0);

or wants to report all types of PHP errors,

error_reporting(E_ALL); //this will not include error type E_STRICT

error_reporting(-1); // this will include E_STRICT as well.

For more details about error_reporting, refer following link of PHP manual,

http://php.net/manual/en/function.error-reporting.php

To see all types of error level (predefined) constants, refer

http://www.php.net/manual/en/errorfunc.constants.php