UIMacros: {snippet} and {snippetArea} without name has name '' in both PHP 5 and PHP 7

Author: dg

src/Bridges/ApplicationLatte/UIMacros.php

@@ -114,13 +114,13 @@ public static function renderSnippets(Nette\Application\UI\Control $control, \st
 		$payload = $control->getPresenter()->getPayload();
 		if (isset($local->blocks)) {
 			foreach ($local->blocks as $name => $function) {
-				if ($name[0] !== '_' || !$control->isControlInvalid(substr($name, 1))) {
+				if ($name[0] !== '_' || !$control->isControlInvalid((string) substr($name, 1))) {
 					continue;
 				}
 				ob_start();
 				$function = reset($function);
 				$snippets = $function($local, $params + ['_snippetMode' => TRUE]);
-				$payload->snippets[$id = $control->getSnippetId(substr($name, 1))] = ob_get_clean();
+				$payload->snippets[$id = $control->getSnippetId((string) substr($name, 1))] = ob_get_clean();
 				if ($snippets !== NULL) { // pass FALSE from snippetArea
 					if ($snippets) {
 						$payload->snippets += $snippets;

tests/Application.Latte/expected/UIMacros.snippet.phtml

@@ -1,7 +1,7 @@
 %A%
 // block _
 //
-if (!function_exists($_b->blocks['_'][] = '_%[a-z0-9]+%__')) { function _%[a-z0-9]+%__($_b, $_args) { foreach ($_args as $__k => $__v) $$__k = $__v; $_control->redrawControl(false, FALSE)
+if (!function_exists($_b->blocks['_'][] = '_%[a-z0-9]+%__')) { function _%[a-z0-9]+%__($_b, $_args) { foreach ($_args as $__k => $__v) $$__k = $__v; $_control->redrawControl(%[false']+%, FALSE)
 ;
 }}