Common tidy operations can be simplified into a single PHP function call which allows you to tidy a string or input file using a specified configuration...

tidy_repair_string($tidy, $data [, $config_file]);

tidy_repair_file($tidy, $data, [, $config_file [, $use_include_path]]);

Repairing http://www.coggeshall.org/
<?php
    echo tidy_repair_file("http://www.coggeshall.org/", "basic.tcfg");
?>
Repairing user POST data
<?php
    if(!empty($_POST['data'])) {
        $data = tidy_repair_string($_POST['data']);
    }
?>