private void appendArrayKey(StringBuilder buff, Memory k) {
        buff.append("%5B") // [
                .append(encoder.apply(k))
                .append("%5D"); // ]
    }
We should keep trace when traversing arrays.
exts/jphp-zend-ext/src/main/java/org/develnext/jphp/zend/ext/standard/HttpQueryBuilder.java