* @param bool $pretty Add non-significant whitespace to improve readability (default: false).
* @param int $escaping Bitfield consisting of FormatJson::.*_OK class constants.
* @return string|false JSON string if successful; false upon failure
*/
* @param bool $pretty Add non-significant whitespace to improve readability (default: false).
* @param int $escaping Bitfield consisting of FormatJson::.*_OK class constants.
* @return string|false JSON string if successful; false upon failure
*/