Startup and shutdown functions can be used for one_time
initialization and deinitialization of your modules_ As discussed
earlier in this chapter (see the description of the Zend module
descriptor block), there are module, and request startup
and shutdown events_
The module startup and shutdown functions are called whenever a
module is loaded and needs initialization; the request startup and
shutdown functions are called every time a request is processed
(meaning that a file is being executed)_
For dynamic extensions, module and request startup/shutdown events
happen at the same time_
Declaration and implementation of these functions can be done with
macros; see the earlier section "Declaration of the Zend Module
Block" for details_
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