Update README.md

Author: mevdschee

README.md

@@ -19,6 +19,7 @@ There are also ports of this script in:
 - [Java Spring Boot + jOOQ](https://github.com/mevdschee/java-crud-api/tree/master/full) (work in progress)
 
 There are also proof-of-concept ports of this script that only support basic REST CRUD functionality in:
+[PHP](https://github.com/mevdschee/php-crud-api/blob/master/extras/core.php)
 [Java](https://github.com/mevdschee/java-crud-api/blob/master/core/src/main/java/com/tqdev/CrudApiHandler.java),
 [Go](https://github.com/mevdschee/go-crud-api/blob/master/api.go),
 [C# .net core](https://github.com/mevdschee/core-data-api/blob/master/Program.cs),