Add check for escapeshellarg function

app/Http/Controllers/SetupController.php

@@ -45,6 +45,10 @@ class SetupController extends Controller
             throw new PrettyPageException(trans('setup.database.table-already-exists', ['tables' => json_encode($existingTables)]), 1);
         }
 
+        if (! function_exists('escapeshellarg')) {
+            throw new PrettyPageException(trans('setup.disabled-functions.escapeshellarg'), 1);
+        }
+
         return view('setup.wizard.info');
     }
 

resources/lang/en/setup.yml

@@ -10,6 +10,9 @@ file:
 permissions:
   storage: Unable to write to storage directory, please check the permissions.
 
+disabled-functions:
+  escapeshellarg: "The escapeshellarg function is disabled in your php.ini configuration. Please contact your web hosting provider to enable it or perform the installation manually: http://t.cn/REzBZUe"
+
 locked:
   title: Already installed
   text: You appear to have already installed Blessing Skin Server. To reinstall please clear your old database tables first, or use a new database table prefix.

resources/lang/zh_CN/setup.yml

@@ -10,6 +10,9 @@ file:
 permissions:
   storage: 无法写入 storage 目录，请检查目录权限是否正确
 
+disabled-functions:
+  escapeshellarg: 你的主机提供商禁用了 escapeshellarg 函数，而此函数是本安装程序必须使用的。请联系你的主机提供商解决，或者参照这篇文章进行手动安装：http://t.cn/REzBZUe
+
 locked:
   title: 已安装过
   text: Blessing Skin Server 看起来已经安装妥当。如果想重新安装，请删除数据库中的旧数据表，或者换一个数据表前缀。