SimplePie_Misc::stripos PHP Method

    function stripos($haystack, $needle, $offset = 0)
    {
        if (function_exists('stripos')) {
            return stripos($haystack, $needle, $offset);
        } else {
            if (is_string($needle)) {
                $needle = strtolower($needle);
            } elseif (is_int($needle) || is_bool($needle) || is_double($needle)) {
                $needle = strtolower(chr($needle));
            } else {
                trigger_error('needle is not a string or an integer', E_USER_WARNING);
                return false;
            }
            return strpos(strtolower($haystack), $needle, $offset);
        }
    }

 public function __construct($mysql_location, $name, $extension)
 {
     $host = $mysql_location->get_host();
     if (SimplePie_Misc::stripos($host, 'unix(') === 0 && substr($host, -1) === ')') {
         $server = ':' . substr($host, 5, -1);
     } else {
         $server = $host;
         if ($mysql_location->get_port() !== null) {
             $server .= ':' . $mysql_location->get_port();
         }
     }
     if (strpos($mysql_location->get_userinfo(), ':') !== false) {
         list($username, $password) = explode(':', $mysql_location->get_userinfo(), 2);
     } else {
         $username = $mysql_location->get_userinfo();
         $password = null;
     }
     if ($this->mysql = mysql_connect($server, $username, $password)) {
         $this->id = $name . $extension;
         $this->options = SimplePie_Misc::parse_str($mysql_location->get_query());
         if (!isset($this->options['prefix'][0])) {
             $this->options['prefix'][0] = '';
         }
         if (mysql_select_db(ltrim($mysql_location->get_path(), '/')) && mysql_query('SET NAMES utf8') && ($query = mysql_unbuffered_query('SHOW TABLES'))) {
             $db = array();
             while ($row = mysql_fetch_row($query)) {
                 $db[] = $row[0];
             }
             if (!in_array($this->options['prefix'][0] . 'cache_data', $db)) {
                 if (!mysql_query('CREATE TABLE `' . $this->options['prefix'][0] . 'cache_data` (`id` TEXT CHARACTER SET utf8 NOT NULL, `items` SMALLINT NOT NULL DEFAULT 0, `data` BLOB NOT NULL, `mtime` INT UNSIGNED NOT NULL, UNIQUE (`id`(125)))')) {
                     $this->mysql = null;
                 }
             }
             if (!in_array($this->options['prefix'][0] . 'items', $db)) {
                 if (!mysql_query('CREATE TABLE `' . $this->options['prefix'][0] . 'items` (`feed_id` TEXT CHARACTER SET utf8 NOT NULL, `id` TEXT CHARACTER SET utf8 NOT NULL, `data` TEXT CHARACTER SET utf8 NOT NULL, `posted` INT UNSIGNED NOT NULL, INDEX `feed_id` (`feed_id`(125)))')) {
                     $this->mysql = null;
                 }
             }
         } else {
             $this->mysql = null;
         }
     }
 }