   #PHP Manual Function Handling functions get_defined_functions
   register_tick_function

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                          register_shutdown_function

   (PHP 3>= 3.0.4, PHP 4 )
   register_shutdown_function --  Register a function for execution on
   shutdown

Description

   void register_shutdown_function ( callback function)

   Registers the function named by function to be executed when script
   processing is complete.

   Multiple calls to register_shutdown_function() can be made, and each
   will be called in the same order as they were registered. If you call
   exit() within one registered shutdown function, processing will stop
   completely and no other registered shutdown functions will be called.

   The registered shutdown functions are called after the request has
   been completed (including sending any output buffers), so it is not
   possible to send output to the browser using echo() or print(), or
   retrieve the contents of any output buffers using ob_get_contents().

     Note: Typically undefined functions cause fatal errors in PHP, but
     when the function called with register_shutdown_function() is
     undefined, an error of level E_WARNING is generated instead. Also,
     for reasons internal to PHP, this error will refer to Unknown() at
     line #0.

   See also auto_append_file, exit(), and the section on connection
   handling.
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