Simple Watson Visual Recognition implementation with Twilio MMS in PHP. Twilio will POST an image URL through via MediaUrl0, so it's easy to grab that and send it on to Watson for recognition.

watson-visual-recognition-twilio-sample.php

if(isset($_REQUEST['MediaUrl0'])) {
	$img = $_REQUEST['MediaUrl0'];
	$apikey = 'put_a_real_key_here';
	
	$data = `curl -u "apikey:$apikey" "https://gateway.watsonplatform.net/visual-recognition/api/v3/classify?url=$img&version=2018-03-19"`;
	$data = json_decode($data);
	
	$thing = $data->images[0]->classifiers[0]->classes[0]->class;
	
	$intros = array('Hey', 'Cool', 'Jeepers', 'Wow', 'Awesome', 'Nifty', 'Woah', 'Yikes', 'Well', 'Eh', 'Um', 'Uh', 'Zoinks');
	$intro = array_rand($intros);
	$intro = $intros[$intro];
	
	$vowels = array('a','e','i','o','u');
	if(in_array($thing{0}, $vowels)) $article = 'an';
	else $article = 'a';
	
	echo '<?xml version="1.0" encoding="UTF-8"?>
	<Response>
	    <Message>'.$intro.', that looks like '.$article.' '.$thing.'.</Message>
	</Response>';
	exit;
}