php man page for register_shutdown_function

REGISTER_SHUTDOWN_FUNCTION(3)						 1					     REGISTER_SHUTDOWN_FUNCTION(3)

register_shutdown_function - Register a function for execution on shutdown

SYNOPSIS
       void register_shutdown_function (callable  $callback, [mixed  $parameter], [mixed  $...])

DESCRIPTION
	Registers a $callback to be executed after script execution finishes or exit(3) is called.

	Multiple  calls  to  register_shutdown_function(3)  can be made, and each will be called in the same order as they were registered. If you
       call exit(3) within one registered shutdown function, processing will stop completely and no other registered shutdown  functions  will	be
       called.

PARAMETERS
	      o $callback
		-  The	shutdown  callback  to register.  The shutdown callbacks are executed as the part of the request, so it's possible to send
		output from them and access output buffers.

	      o $parameter
		- It is possible to pass parameters to the shutdown function by passing additional parameters.

	      o $...
		-

RETURN VALUES
	No value is returned.

ERRORS
/EXCEPTIONS
	If the passed callback is not callable a E_WARNING level error will be generated.

EXAMPLES
       Example #1

	      register_shutdown_function(3) example

	      <?php
	      function shutdown()
	      {
		  // This is our shutdown function, in
		  // here we can do any last operations
		  // before the script is complete.

		  echo 'Script executed with success', PHP_EOL;
	      }

	      register_shutdown_function('shutdown');
	      ?>

NOTES
       Note

	       Working directory of the script can change inside the shutdown function under some web servers, e.g. Apache.

       Note

	       Shutdown functions will not be executed if the process is killed with a SIGTERM or SIGKILL signal. While  you  cannot  intercept  a
	      SIGKILL, you can use pcntl_signal(3) to install a handler for a SIGTERM which uses exit(3) to end cleanly.

SEE ALSO
       auto_append_file, exit(3), The section on connection handling.

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