public static Memory str_ireplace(Environment env, TraceInfo trace, Memory search, Memory replace, Memory string) {
        return str_ireplace(env, trace, search, replace, string, Memory.UNDEFINED);
    }
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