php - Set up yii2 basic application on server

I have a yii2 basic template working fine in local, but when I uploaded files on server it is not working.

index.php

// comment out the following two lines when deployed to production

//defined('YII_DEBUG') or define('YII_DEBUG', true);
//defined('YII_ENV') or define('YII_ENV', 'dev');

require(__DIR__ . '/../vendor/autoload.php');
require(__DIR__ . '/../vendor/yiisoft/yii2/Yii.php');

$config = require(__DIR__ . '/../config/web.php');

(new yii\web\Application($config))->run();

when I open URL http://iicose.com/mlm/web/index.php it gave me following error

Warning: Unexpected character in input: '\' (ASCII=92) state=1 in /home/iicose/public_html/mlm/index.php on line 12

Parse error: syntax error, unexpected T_STRING in /home/iicose/public_html/mlm/index.php on line 12

I figured out that it is causing because of using __DIR__ when I removed this the file loaded. But further I have to change everywhere in the vendor directory according to it which I think is not a good practice.

Can someone tell me a fix to this.

EDIT:
This question is duplicate of
Unexpected character in input: '\' (ASCII=92) state=1

Answer

Seems like you are using older version of PHP (without namescaces support) on production server. Check this related question.

Yii 2 requires at least PHP 5.4, so you must have at least this version on both development and production servers to get it working.