Known issue (and solution) with deprecated split() function
As discussed in previous threads, the split() Function was deprecated in PHP 5.3. This function is used by Validation Toolkit server behaviors. Replacing the WAVT_Scripts_PHP.php in your installation of Validation Toolkit provides the run-time code necessary to correct this issue.
To get the fix, go to the Download Center of our website. Log in and visit downloadcenter.php. Click on Validation Toolkit (or the suite you owns that contains it); then click on the Known Issues section. Download the zip file and follow the instructions in the readme file.