Added PHPhub (#609)

Add PHPhub

Author: cyrilbois

README.md

@@ -1465,6 +1465,7 @@ like WhatsApp | `apiKey` | Yes | Yes |
 | [Hackerearth](https://www.hackerearth.com/docs/wiki/developers/v4) | For compiling and running code in several languages | `apiKey` | Yes | Unknown |
 | [Judge0 CE](https://ce.judge0.com/) | Online code execution system | `apiKey` | Yes | Unknown |
 | [Let's Count](https://letscountapi.com) | Create, retrieve, update, increment, and decrement counters identified by namespace and key | No | Yes | Unknown |
+| [PHPhub](https://phphub.net/linter/) | PHP syntax checker | No | Yes | No |
 | [Pythonium](https://pythonium.net/linter) | Validate Python code syntax | No | Yes | No |
 | [Softwium](https://softwium.com/sql-validator/) | Validate SQL queries | No | Yes | No |