title: What PHP web crawler libraries are available?
body: <p>I'm looking for some robust, well documented PHP web crawler scripts. Perhaps a PHP port of the Java project - <a href="http://wiki.apache.org/nutch/NutchTutorial" rel="nofollow">http://wiki.apache.org/nutch/NutchTutorial</a></p>
  
  <p>I'm looking for both free and non free versions.</p>