Laravel 5.6 updates

Travis config update

Removed HHVM script as Laravel no longer support HHVM after releasing 5.3

vendor/symfony/debug/FatalErrorHandler/ClassNotFoundFatalErrorHandler.php

@@ -83,7 +83,7 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
      *
      * @return array An array of possible fully qualified class names
      */
-    private function getClassCandidates($class)
+    private function getClassCandidates(string $class): array
     {
         if (!\is_array($functions = spl_autoload_functions())) {
             return array();
@@ -124,14 +124,7 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
         return array_unique($classes);
     }
 
-    /**
-     * @param string $path
-     * @param string $class
-     * @param string $prefix
-     *
-     * @return array
-     */
-    private function findClassInPath($path, $class, $prefix)
+    private function findClassInPath(string $path, string $class, string $prefix): array
     {
         if (!$path = realpath($path.'/'.strtr($prefix, '\\_', '//')) ?: realpath($path.'/'.\dirname(strtr($prefix, '\\_', '//'))) ?: realpath($path)) {
             return array();
@@ -148,14 +141,7 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
         return $classes;
     }
 
-    /**
-     * @param string $path
-     * @param string $file
-     * @param string $prefix
-     *
-     * @return string|null
-     */
-    private function convertFileToClass($path, $file, $prefix)
+    private function convertFileToClass(string $path, string $file, string $prefix): ?string
     {
         $candidates = array(
             // namespaced class
@@ -192,14 +178,11 @@ class ClassNotFoundFatalErrorHandler implements FatalErrorHandlerInterface
                 return $candidate;
             }
         }
+
+        return null;
     }
 
-    /**
-     * @param string $class
-     *
-     * @return bool
-     */
-    private function classExists($class)
+    private function classExists(string $class): bool
     {
         return class_exists($class, false) || interface_exists($class, false) || trait_exists($class, false);
     }