Removes the style markup in html tags, derived from a text editor

gistfile1.php

<?php
/**
 * Removes the style markup in html tags, derived from a text editor
 * 
 * @param string $value The input string
 * @return string
 * @link https://gist.github.com/3078188
 * 
 * */
function clearStyle($value)
{
    $value = preg_replace("~<(a|ol|ul|li|h[1-6r]|d[dlt]|em|p|i|b|s|strong|span|div|table|t[dhr])\s?(style.*)?/>~i", "<$1>", $value);
 
    return $value;
}