Convert any string to an integer between 0-9

strToInt.php

<?php

/**
 * Convert any string to an integer between 0-9
 *
 * @param string $str Any string
 * @return integer Integer between 0-9
 */
function strToInt($str) {
	preg_match('/\d/', md5((string) $str), $matches, PREG_OFFSET_CAPTURE);
	return ($matches[0]) ? (integer) $matches[0][0] : 0;
}