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1) import database

2) SELECT * FROM core_config_data WHERE path = 'web/unsecure/base_url' OR path = 'web/secure/base_url';

3)  delete content on var/  

4) change database info on app/etc/local.xml


http://stackoverflow.com/questions/20773160/could-not-determine-temp-directory-please-specify-a-cache-dir-manually
If admin pages are on error:

Firstly, copy /lib/Zend/Cache/Backend/File.php to 
              /app/code/local/Zend/Cache/Backend/File.php
              
Then on line 91 or near this line, you will find:

'cache_dir' => null,

Change to:

'cache_dir' => "var/tmp/",

Now create a directory named tmp(or whatever name you have given above) :  /var/tmp

change permisssion to /var/tmp  to 777