calculator_service

An observer of unicorn is simply a webservice whose the reponse page validate the [wiki:observer-reponse] schema (output contract). In this part, we're going to make a calculator webservice which respect this output contract. BR

caculator.php

Explanation

 * Input: 
  * the parameter uri = path to your text file what is accessible by your server
  * the parameter x2 = 0/1: double the results 
 * Output: a observer-reponse which expose all possible calculation result in the file
 * Test: http://flyingman.sophia.w3.org/calculator.php?uri=http://flyingman.sophia.w3.org/test.txt&x2=1