register_tick_function
    (PHP 4 >= 4.0.3, PHP 5)
register_tick_function -- 
     Register a function for execution on each tick
    
Description
bool 
register_tick_function ( callback function [, mixed arg [, mixed ...]] )
     Registers the function named by func to be
     executed when a tick is
     called. Also, you may pass an array consisting of an object and a 
     method as the func.
    
     
Example 1. register_tick_function() example 
<?php // using a function as the callback register_tick_function('my_function', true);
  // using an object->method $object = new my_class(); register_tick_function(array(&$object, 'my_method'), true); ?>
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  | 
    | Warning | 
      register_tick_function() should not be used with
       threaded webserver modules. Ticks are not working in ZTS mode and may
       crash your webserver.
       | 
     See also declare and 
     unregister_tick_function().