CanonicalizeUrl

The CanonicalizeUrl method is a utility function that canonicalizes a URL into a standard form to avoid duplicates. For example, "http://www.chilkatsoft.com/" and "http://www.chilkatsoft.com/default.asp" are the same URL.

Download Chilkat Spider ActiveX

<?php

//  The Chilkat Spider component/library is free.
$spider = new COM("Chilkat.Spider");

//  Does a DNS lookup to find the default domain, which may or may not include the "www." depending on the DNS results.
//  Also domain names are converted to lowercase:
print $spider->canonicalizeUrl('http://www.ChilkatSoft.com/') . "\n";

//  CanonicalizeUrl will drop the HTML fragment:
print $spider->canonicalizeUrl('http://www.chilkatsoft.com/purchase2.asp#buyZip') . "\n";

//  If a username/password is in the URL, it gets dropped:
print $spider->canonicalizeUrl('http://username:password@www.chilkatsoft.com/purchase2.asp#buyZip') . "\n";

//  Port 80 and 443 are dropped:
print $spider->canonicalizeUrl('http://www.chilkatsoft.com:80/purchase2.asp') . "\n";
print $spider->canonicalizeUrl('https://www.paypal.com:443/') . "\n";

//  Removes default pages:
//  default.asp, index.html, index.htm, default.html, index.htm, default.htm
//  index.php, index.asp, default.php, .cfm, .aspx, ,php3, .pl, .cgi, .txt, .shtml, .phtml
print $spider->canonicalizeUrl('http://www.chilkatsoft.com/index.asp') . "\n";
print $spider->canonicalizeUrl('http://www.chilkatsoft.com/index.asp') . "\n";
print $spider->canonicalizeUrl('http://www.chilkatsoft.com/index.php') . "\n";
print $spider->canonicalizeUrl('http://www.chilkatsoft.com/index.pl') . "\n";
print $spider->canonicalizeUrl('http://www.chilkatsoft.com/index.htm') . "\n";

//  Output:
//  http://chilkatsoft.com/
//  http://chilkatsoft.com/purchase2.asp
//  http://chilkatsoft.com/purchase2.asp
//  http://chilkatsoft.com/purchase2.asp
//  https://www.paypal.com/
//  http://chilkatsoft.com/
//  http://chilkatsoft.com/
//  http://chilkatsoft.com/
//  http://chilkatsoft.com/
//  http://chilkatsoft.com/

?>