schedule_check.php

<?php
ini_set('display_errors', true);
error_reporting(E_ALL);

require __DIR__ . '/vendor/autoload.php';

use Symfony\Component\DomCrawler\Crawler;
use Twilio\Rest\Client;

$sid = 'ABC123';
$token = '321CBA';
$client = new Client($sid, $token);

try {
	$url = "https://my/scheduling/url";
	$html = file_get_contents($url);
	$crawler = new Crawler($html);

	header('Content-Type: text/plain');

	$found = false;
	$nodes = $crawler->filter('body div.media');
	foreach ($nodes as $node) {
		$text = strtolower($node->textContent);
		$text = str_replace(["\n","\r"], "", $text);

		if (strpos($text, "no openings available") === false) {
			$found = true;
			// There might be an opening!
			$body = "$text\n$url";
			$client->messages->create('+15551212', [
				'from' => '+15551212',
				'body' => $body,
			]);
		}
	}

	if (!$found) {
		echo "no openings available";
	}
}catch (\Exception $e) {
	$client->messages->create('+15551212', [
		'from' => '+15551212',
		'body' => "Error checking schedule: " . $e->getMessage(),
	]);
}