Using Sockets in PHP - Whois Example

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So you have learned how to connect to servers, fetch results, loop through results and finally close connections. So I thought I would include a more practical example in this section and I chose to do a whois example which connects to certain whois servers and checks for a record for a certain domain.

<?php extract($_POST);  function whois($domain,$ext){  $url=$domain.$ext;  /* Use a switch() statement to determine which whois  server is the best to use for the entered domain. */ switch($ext){  case ".co.uk":  $whois = "whois.nic.uk";  break;  case ".com":  $whois = "whois.networksolutions.com";  break;  case ".fr":  $whois = "whois.nic.fr";  break;  case ".biz":  $whois = "whois.biz";  break;  default:  $whois = "whois.networksolutions.com";  }  if (trim($url) &lt;&gt; "") {    $url = trim($url); /* Open the connection to the above whois server */  $f = fsockopen($whois, 43, $errno, $errstr, 30);    if (!$f) {       echo "Connection To Server Failed ($errno)";    } else { /* Send the domain to the server and return the results */       fputs($f, "$url&#92;r&#92;n");       print "&lt;pre&gt;&#92;r&#92;n";     while (!feof($f)) {          echo fread($f,128);       }      print "&lt;/pre&gt;"; /* Use fclose to close the connection to the whois  server */       fclose($f);    }  }else{  echo "Invalid domain entered";  }  } ?>

Notice I have written this code in a function so it is more practical and reusable than the other examples in this tutorial. They can be coded up into a function with relative ease.

Next: Conclusion >>
 

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· Great Job, Andrew!Most of the socket tutorials I've seen demonstrate sockets by...    · Thanks very much tim    · An Excellent piece of work, explained so well. Made such a big topic look so simple....    · Thanks for the comments.    · Hello Andrew!Can you tell me more regarding this request please:$request =...    · A HEAD request only sends the headers to the browser/cliet. It does not send any...    · It is extremely difficult to read the topic .Please enlarge the code.   >>> Post your comment now!