oxstr.php

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<?php

class oxStr
{
    static protected $_oHandler;

    public function __construct()
    {
    }

    static public function getStr()
    {
        if (!isset(self::$_oHandler)) {
            //let's init now non-static instance of oxStr to get the instance of str handler
            self::$_oHandler = oxNew("oxStr")->_getStrHandler();
        }

        return self::$_oHandler;
    }

    protected function _getStrHandler()
    {
        if (oxRegistry::getConfig()->isUtf() && function_exists('mb_strlen')) {
            return oxNew("oxStrMb");
        }

        return oxNew("oxStrRegular");
    }

}