Add support PHP 7.4

Author: stagemteam

Build/PharStub.php

@@ -1,14 +1,15 @@
-<?php
-spl_autoload_register(function ($class) {
-    include 'phar://PHPExcel/' . str_replace('_', '/', $class) . '.php';
-});
-
-try {
-    Phar::mapPhar();
-    include 'phar://PHPExcel/PHPExcel.php';
-} catch (PharException $e) {
-    error_log($e->getMessage());
-    exit(1);
-}
-
-__HALT_COMPILER();
+<?php
+
+spl_autoload_register(function ($class): void {
+    include 'phar://PHPExcel/' . str_replace('_', '/', $class) . '.php';
+});
+
+try {
+    Phar::mapPhar();
+    include 'phar://PHPExcel/PHPExcel.php';
+} catch (PharException $e) {
+    error_log($e->getMessage());
+    exit(1);
+}
+
+__HALT_COMPILER();