title: PHP threading call to a php function asynchronously
body: <p>What I'm looking to do is load in some data from a database or from memcache asynchronously.</p>
  
  <p>I know, I know.  "PHP doesn't support threading".</p>
  
  <p>But what about register_tick_function?  Isn't that indeed threading?</p>
  
  <p>Has anyone done any kind of predictive preload or really any background processing utilizing register_tick_function?</p>