resolve_redirects: only use three argument version of get_headers() on php 7.1+

include/functions.php

@@ -2008,6 +2008,9 @@
 		if ($nest > 10)
 			return false;
 
+		if (version_compare(PHP_VERSION, '7.1.0', '>=')) {
+			$context = stream_context_create($context_options);
+
 			$context_options = array(
 				'http' => array(
 					 'header' => array(
@@ -2023,8 +2026,10 @@
 				$context_options['http']['proxy'] = _HTTP_PROXY;
 			}
 
-		$context = stream_context_create($context_options);
 			$headers = get_headers($url, 0, $context);
+		} else {
+			$headers = get_headers($url, 0);
+		}
 
 		if (is_array($headers)) {
 			$headers = array_reverse($headers); // last one is the correct one