I have a wordpress site and I have to do modifications very often so i would like to create clone of that website for testing because i would like to test my modification first for a few days before i put them on my site.
There are links to the "real" site everywhere so i'm not sure how to do that.
UPDATE (improved explanation):
Problems:
links are absolute
this need to be online so other developers can test site
Copy/paste your entire files from your domain to everywhere you want as first step.
Go to the phpMyAdmin or use a tool that permit to you to export your database as .sql.
Open the .sql file and run a find and replace and replace all your absolute path (just the one before wordpress: ie.: of this http://www.yoursite.com/wp-content/etc. Replace only http://www.yoursite.com)
Check for the permission of the DB, maybe you should change also the Server name, DB Name, Username and Password.
Create a new database and import the file you exported and modified the minute before.
Now you got a clone of the previous website ready for your experiments on both side, files and DB.