implement single sign on with php to sharepoint 2010

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i have a requirement that a landing page should be there where the user will be authenticated and authorization process will be performed and then redirected to the sharepoint site url

i am having sharepoint 2010 site with windows authentication so i want to implement single sign on from php, java & asp.net to sharepoint site

when i am trying to access the url of the page the site is giving a popup of windows security logon which does not allow me to access the iis to execute the code written in page load

How to by pass the windows security logon while implementing single sign on to sharepoint 2010