title: A* search algorithm in PHP
body: <p>Does anyone have an implementation of the <a href="http://en.wikipedia.org/wiki/A%2A_search_algorithm" rel="nofollow">A* algorithm</a> in PHP? I know that wikipedia has a pseudocode and a link to a C++ one, but I can't seem to find one already written in PHP.</p>
  
  <p>I am also looking for an efficient written A* algorithm </p>