Clean URL Generator for Zend

ZendCleanURL.php

<?php
/**
 * Generates a uristub of maximum specified length.
 *
 * @access protected
 * @param string $tableName The name of the table to query
 * @param string $tableField The table column to check
 * @param string $uristub The initial input string (page title) to clean
 * @param int $length The maximum allowable length for the clean url
 * @param mixed $iteration The current iteration, when duplicates found
 * @return string
 */
protected function generateUristub($tableName, $tableField, $uristub, $length = 30, $iteration = NULL)
{
    // begin uristub generation on first iteration
    if (is_null($iteration)) {
	// set the locale, just once
	setlocale(LC_ALL, 'en_US.UTF8');
	// clean the uristub
	$uristub = iconv('UTF-8', 'ASCII//TRANSLIT', $uristub);
	$uristub = preg_replace("/[^a-zA-Z0-9\/_|+ -]/", '', $uristub);
	$uristub = preg_replace("/[\/_|+ -]+/", '-', $uristub);
	$uristub = strtolower(trim($uristub, '-'));

	// ensure uristub is less than length
	if (strlen($uristub) > $length) {
	    // get char at chopped position
	    $char = $uristub[$length-1];
	    // quick chop (leave room for 9 iterations)
	    $uristub = substr($uristub, 0, $length - 1);

	    // if we chopped mid word
	    if ($char != '-') {
		    $pos = strrpos($uristub, '-');
		    if ($pos !== FALSE) {
			    $uristub = substr($uristub, 0, $pos);
		    }
	    }
	}
    }

    // if we have an iteration, add to the uristub
    $uristubToCheck = !empty($iteration) ? $uristub . $iteration : $uristub;

    // check if the uristub exists
    $sql = sprintf('SELECT 1 FROM `%s` WHERE `%s` = %s',
		    $tableName,
		    $tableField,
		    $this->_db->quote($uristubToCheck));

    try {
	$result = $this->_db->query($sql)->fetch();
	if (!$result) {
	    return $uristubToCheck;
	}
    } catch (Exception $e) {
	// fatal
	die($e->getMessage());
    }

    // increment iteration before trying again
    $iteration = (is_null($iteration)) ? 1 : ++$iteration;
    return $this->generateUristub($tableName, $tableField, $uristub, $length, $iteration);
}
?>