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Enhancements
* add callbacks in php.ini
* function replacement
ideas from lach AT php5.pl:
* passing function parameters by reference to
pre-call function, so that they can be changed
* allowing to stop executing of the hook chain
by, for example, returning bool(false) from one
of pre-call function
* additional parameter passed to pre-call function
(by reference) allowing to set return value for
function