New: JsonMapper in Data Structure and Storage section.

https://github.com/netresearch/jsonmapper

README.md

 * [PHP Object Storage](https://github.com/herrera-io/php-object-storage) - A library for object storage.
 * [Fractal](https://github.com/php-loep/fractal) - A library for converting complex data structures to JSON output.
 * [PINQ](https://github.com/TimeToogo/Pinq) - A real Linq library for PHP.
+* [JsonMapper](https://github.com/netresearch/jsonmapper) - A library that maps nested JSON structures onto PHP classes.
 
 ## Notifications
 *Libraries for working with notification software.*