Empower your website with Wolfram Alpha

Wolfram Alpha‘s computational knowledge engine or answer engine developed by Wolfram Research, which can be consumed as a service as well. Users submit queries and computation requests. Wolfram Alpha then computes answers and relevant visualizations from a knowledge base of curated, structured data that come from other sites and books. 2000 non-commercial API calls per month are free.

They provide a nice set of API Language Libraries to get you started.

<?php  
  $appID = 'PLACE_YOUR_APP_ID_HERE';

 
  if (!$queryIsSet) die();

 
  $qArgs = array();

  if (isset($_REQUEST['assumption']))

    $qArgs['assumption'] = $_REQUEST['assumption'];

 
  // instantiate an engine object with your app id

  $engine = new WolframAlphaEngine( $appID );

 
  // we will construct a basic query to the api with the input 'pi'

  // only the bare minimum will be used

  $response = $engine->getResults( $_REQUEST['q'], $qArgs);

 
  // getResults will send back a WAResponse object

  // this object has a parsed version of the wolfram alpha response

  // as well as the raw xml ($response->rawXML) 

  
  // we can check if there was an error from the response object

  if ( $response->isError() ) {

?>
  <h1>There was an error in the request</h1>
  </body>
  </html>
<?php
    die();

  }

?>

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