title: time out problem with gethostbyaddr() function in php
body: <p>recently i noticed that on my new server the <code>gethostbyaddr()</code> function which is used on my site to get the referes' hosts, it makes the page load 5 times slower.</p>
  
  <p>and when I removed it the time out problem is gone </p>
  
  <p>what is wrong with this function and my new Centos linux server config.</p>
  
  <p>and what else i can use instead of this php function to get the host name of my referers.</p>