@Immutable
    public static Memory convert_cyr_string(Environment env, TraceInfo trace, String str, String from, String to) {
        throw new TodoException();
    }
Parses the cslashes bitmap returning an actual bitmap.

@param charset the bitmap string

@return the actual bitmap
exts/jphp-zend-ext/src/main/java/org/develnext/jphp/zend/ext/standard/StringFunctions.java