Develop a script to get all twitter users who retweeted a tweet

Hello, ** No copy paste bid please ** ** if you want your bid to be considered then add "NO COPY & PASTE" at the beginning of your msg/bid ** We have a twitter account and it happens that we tweet a message and it gets retweeted by THOUSANDS of twitter users. We would like to be able of following all of these users to thank them but unfortunately, twitter only shows us few of the users who retweeted. We would like you to develop a tool (in PHP) that tracks all the retweets and gives us the ids of all twitter accounts who retweeted our tweet. IMPORTANT : Please take into account that some tweets get re-tweeted THOUSANDS OF TIMES. -->YOUR SCRIPT SHOULD BE ABLE OF GETTING ALL OF THE USERS WHO RE-TWEETED !! Thanks