Документация PHP
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New INI Configuration Directives
Migrating from PHP 5.1.x to PHP 5.2.x
Error Reporting
Some of the existing E_ERROR conditions have been converted to something that can be caught with a user-defined error handler. If an E_RECOVERABLE_ERROR is not handled, it will behave in the same way as E_ERROR behaves in all versions of PHP. Errors of this type are logged as Catchable fatal error.
This change means that the value of the E_ALL error_reporting constant is now 6143, where the previous value was 2047. Because PHP constants have no meaning outside of PHP, in some cases the integer value is used instead so these will need to be adjusted. So for example by setting the error_reporting mode from either the httpd.conf or the .htaccess files, the value has to be changed accordingly. The same applies when the numeric values are used rather than the constants in PHP scripts.
As a side-effect of a change made to prevent duplicate error messages when track_errors is On, it is now necessary to return FALSE from user defined error handlers in order to populate $php_errormsg. This provides a fine-grain control over the levels of messages stored.
New INI Configuration Directives