This script is good for if you have heaps of links lying around and wanna see if they still exist, or if you want to allow people add links to your site but only want them to be able to add links that are real.
$up = fsockopen("www.yourURL.com", 30); // the URL, well is obvious, but its important that you dont put http:// or it will not work, and 30 is how long in seconds it should run for before it determines as a timeout.
echo "<a href=\"http://www.yourURL.com\">Go to URL</a>"; //displays link to URL if its valid
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