PHP PayPal new certificate test

paypal_cert_test.php

<?php

	/*
		File prepared by Matt Weinberg, www.vectormediagroup.com and www.cartthrob.com

		EXPLANATION:

		In 2018, PayPal will be updating their Live/Production environment.

		Many servers, especially older ones, will not be able to connect to PayPal after the settings are changed. 

		You can test your server by switching your CartThrob installation to PayPal's sandbox environment and going
		through the checkout. You can also run the script below. 

		INSTRUCTIONS:
		Place this file in your website root and go to it in a browser. The output will tell you if you should expect
		to have a problem or not. 
		
		If you will have a problem, the output will provide resources for fixing it.

		PLEASE NOTE THAT NO UPDATE TO CARTTHROB OR OTHER CART SOFTWARE CAN FIX SERVERS WITH ERRORS. YOUR SERVER MUST UPDATE
		ITS PHP CURL SETTINGS TO BE COMPATIBLE. 

		More information from PayPal can be found here: 
		https://www.paypal-knowledge.com/infocenter/index?page=content&widgetview=true&id=FAQ1766&viewlocale=en_US&direct=en

	*/

	$ch = curl_init("https://api-3t.paypal.com/nvp");
	curl_setopt($ch, CURLOPT_HEADER, 0);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
	$connect = curl_exec($ch); 

	if (!$connect) {
		echo "FAILURE: Your site will not be able to connect to PayPal after June 17th, 2016. Please contact your host and tell them to \"update PHP's cURL so it can successfully connect to https://api-3t.paypal.com/nvp\"." . PHP_EOL . PHP_EOL . "They can find more information here: https://www.paypal.com/au/webapps/mpp/tls-http-upgrade. " . PHP_EOL . PHP_EOL . "The exact error is:" . PHP_EOL;
		print_r(curl_error($ch));
	} else {
		echo "SUCCESS: You should be able to connect to PayPal.";
	}

	curl_close($ch);
	exit();	
?>