PHP script to check first 10 places in google search for keywords

I need a script in php which i will run every day. The script will check positions for chosen key words and put result in mysql database. The script will check keywords in google search: [login to view URL] and put to database table: date, position (1-10), page address (eg. [login to view URL]) , keyword. There will be many keywords. I know is there a limit for free search with Google search API. It's not problem. You can use other script to complete task, like: [login to view URL]