docs(Vision): fix sample in README (#8288)

Author: bshaffer

Vision/README.md

@@ -33,22 +33,36 @@ on authenticating your client. Once authenticated, you'll be ready to start maki
 ```php
 require 'vendor/autoload.php';
 
-use Google\Cloud\Vision\V1\Feature\Type;
-use Google\Cloud\Vision\V1\ImageAnnotatorClient;
+use Google\Cloud\Vision\V1\AnnotateImageRequest;
+use Google\Cloud\Vision\V1\BatchAnnotateImagesRequest;
+use Google\Cloud\Vision\V1\Client\ImageAnnotatorClient;
+use Google\Cloud\Vision\V1\Feature;
+use Google\Cloud\Vision\V1\Image;
 use Google\Cloud\Vision\V1\Likelihood;
 
 $client = new ImageAnnotatorClient();
 
+// Prepare the request
+$content = file_get_contents('/data/photos/family-photo.jpg', 'r');
+$image = (new Image())
+    ->setContent($content);
+$feature = (new Feature())
+    ->setType(Feature\Type::FACE_DETECTION);
+$request = (new AnnotateImageRequest())
+    ->setImage($image)
+    ->setFeatures([$feature]);
+$batchRequest = (new BatchAnnotateImagesRequest())
+    ->setRequests([$request]);
+
 // Annotate an image, detecting faces.
-$annotation = $client->annotateImage(
-    fopen('/data/photos/family_photo.jpg', 'r'),
-    [Type::FACE_DETECTION]
-);
+$batchResponse = $client->batchAnnotateImages($batchRequest);
 
 // Determine if the detected faces have headwear.
-foreach ($annotation->getFaceAnnotations() as $faceAnnotation) {
-	$likelihood = Likelihood::name($faceAnnotation->getHeadwearLikelihood());
-    echo "Likelihood of headwear: $likelihood" . PHP_EOL;
+foreach ($batchResponse->getResponses() as $response) {
+    foreach ($response->getFaceAnnotations() as $faceAnnotation) {
+        $likelihood = Likelihood::name($faceAnnotation->getHeadwearLikelihood());
+        echo "Likelihood of headwear: $likelihood" . PHP_EOL;
+    }
 }
 ```