How do I make a POST using X-HTTP-Method-Override with a PHP curl request?

Question

I'm working with the Google Translate API and there's the possibility that I could be sending in quite a bit of text to be translated. In this scenerio Google recommends to do the following:

You can also use POST to invoke the API if you want to send more data in a single request. The q parameter in the POST body must be less than 5K characters. To use POST, you must use the X-HTTP-Method-Override header to tell the Translate API to treat the request as a GET (use X-HTTP-Method-Override: GET). Google Translate API Documentation

I know how to make a normal POST request with CURL:

$curl = curl_init();
curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, $data);
$response = curl_exec($curl);
curl_close($curl);
echo $response;

But how do I modify the header to use the X-HTTP-Method-Override?

Answer 1

curl_setopt($ch, CURLOPT_HTTPHEADER, array('X-HTTP-Method-Override: GET') );

Answer 2

http://php.net/manual/en/function.curl-setopt.php

CURLOPT_HTTPHEADER

An array of HTTP header fields to set, in the format array('Content-type: text/plain', 'Content-length: 100')

Thus,

curl_setopt($curl, CURLOPT_HTTPHEADER, array('X-HTTP-Method-Override: GET'));