linkValidator is a PHP class that can validate a URL. It can return true or false, and it is able to return a full error message. License: GNU General Public License (GPL) Changes: The class can follow redirects when its status is between 300 and 399. By default, this option is set to true. It can be disabled (as shown in example 4 in readme.txt) with follow_redirects(). This release has been tested on PHP 4 and 5. PHP warnings have been fixed.

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