PHP Azure OCR - use local file - php

Question

I'm using the Azure OCR Service to get the text of an image back (
https://learn.microsoft.com/de-de/azure/cognitive-services/Computer-vision/QuickStarts/PHP).
So far everything is up and running, but now I would like to use a local file instead of an already uploaded one.
$url->setQueryVariables($parameters);
$request->setMethod(HTTP_Request2::METHOD_POST);
// Request body
$request->setBody("{body}"); // Replace with the body, for example, "{"url": "http://www.example.com/images/image.jpg"}
Unfortunately I don't know how to pass the raw binary as the body of my POST request in PHP.

Answer 1

At first, when we refer local file, we should use 'Content-Type': 'application/octet-stream' in a header, then we can send requests that use a stream resource as the body.
Here's my working code using Guzzle for your reference:
<?php
require 'vendor/autoload.php';
$resource = fopen('./Shaki_waterfall.jpg', 'r');
$client = new \GuzzleHttp\Client();
$res = $client->request('POST', 'https://westus.api.cognitive.microsoft.com/vision/v1.0/analyze', [
'query' => [
'visualFeatures' => 'Categories',
'details' => '',
'language' => 'en'
],
'headers' => [
'Content-Type' => 'application/octet-stream',
'Ocp-Apim-Subscription-Key' => '<Ocp-Apim-Subscription-Key>'
],
'body' => $resource
]);
echo $res->getBody();
Using HTTP_Request2:
<?php
require_once 'HTTP/Request2.php';
$request = new Http_Request2('https://westus.api.cognitive.microsoft.com/vision/v1.0/analyze');
$url = $request->getUrl();
$headers = array(
'Content-Type' => 'application/octet-stream',
'Ocp-Apim-Subscription-Key' => '<Ocp-Apim-Subscription-Key>',
);
$request->setHeader($headers);
$parameters = array(
'visualFeatures' => 'Categories',
'details' => '',
'language' => 'en',
);
$url->setQueryVariables($parameters);
$request->setMethod(HTTP_Request2::METHOD_POST);
$request->setBody(fopen('./Shaki_waterfall.jpg', 'r'));
try {
$response = $request->send();
echo $response->getBody();
} catch (HttpException $ex) {
echo $ex;
}