Best way to generate alias from pagetitle of eform generated documents?

$values['alias'] = '';

$values['alias'] = $modx->db->escape($fields['title']);

/**
 * Format alias to be URL-safe. Strip invalid characters.
 *
 * @param string Alias to be formatted
 * @return string Safe alias
 */
function stripAlias($alias) {
    // let add-ons overwrite the default behavior
    $results = $this->invokeEvent('OnStripAlias', array ('alias'=>$alias));
    if (!empty($results)) {
        // if multiple plugins are registered, only the last one is used
        return end($results);
    } else {
        // default behavior: strip invalid characters and replace spaces with dashes.
        $alias = strip_tags($alias); // strip HTML
        $alias = preg_replace('/[^\.A-Za-z0-9 _-]/', '', $alias); // strip non-alphanumeric characters
        $alias = preg_replace('/\s+/', '-', $alias); // convert white-space to dash
        $alias = preg_replace('/-+/', '-', $alias);  // convert multiple dashes to one
        $alias = trim($alias, '-'); // trim excess
        return $alias;
    }
}

$alias = strtolower($modx->stripAlias(trim($pagetitle)));

<?php
function CreateBlogPost( &$fields ){
    
    global $modx;
	
    $values = array();
    $values['pagetitle'] = $modx->db->escape($fields['title']);
    $values['longtitle'] = '';
    $values['description'] = '';
    $values['alias'] = strtolower($modx->stripAlias(trim($fields['title'])));
    $values['published'] = 1; //0 - if you want the document to be created unpublished
    $values['parent'] = 47; //id of the container for the the new document
    $values['introtext'] = '';
    $values['content'] = $modx->db->escape($fields['content']);
    $values['template'] = 7; //the template of your new document
    $values['searchable'] = 1;
    $values['cacheable'] = 1;
    $values['createdby'] = 1; //this is not the web user ID. Change it to an existing manager id
    $values['createdon '] = time();
    $values['editedby'] = 1; //this is not the web user ID. Change it to an existing manager id
    $values['editedon '] = time();
    //you can find more document properties by browsing the modx_site_content table
	
    //insert the new document. In case you need the id of the new document use the  $newId variable
    $newId = $modx->db->insert( $values, $modx->getFullTableName('site_content') );
	
	//page specific template variables
	$tvValues = array();
	
	$tvValues['tmplvarid'] = 2;//ID of the TV
	$tvValues['contentid'] = $newId; //The ID of the DOCUMENT
	$tvValues['value'] = $modx->db->escape($fields['tags']);
	$modx->db->insert( $tvValues, $modx->getFullTableName('site_tmplvar_contentvalues') );
    
    //clear the cache. in case you use Ditto to display the new document
    clearCache();
	
    return true;
}

function clearCache() {
    include_once "manager/processors/cache_sync.class.processor.php";
    $sync = new synccache();
    $sync->setCachepath("assets/cache/");
    $sync->setReport(false);
    $sync->emptyCache();
}
?>