Migrating from Win+ASP to Linux+PHP with a Live Website

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Howdy,

First a touch of backstory: I am currently in charge of migrating the entire website and internal systems of an existing live business - an 'online comparison' website - from its current home on a windows server running IIS and using ASP.net and SQL Server (aswell as a host of messy scheduled tasks and all sorts of junk) over to a new server running a flavour of linux, php and mysql.

designing the new database and systems in php and mysql is what i do, so that's covered, but the migration itself is something new to me, and i'm wondering if anyone has any past experience or ideas of the best way to manage it in the early stages.

specifically, i want to replace the internal mechanisms without altering the URLs used to access them, so that the site (and more importantly the third parties we connect to/connect to us) won't notice any problems.

so, step one, code up an equivalent of, say, displayTable.asp in php, step two, make sure it works, step three... somehow pass the request for displayTable.asp on the windows server over to displayTable.php on the linux box, without redirecting the user, as for the Web Services there needs to be a response straight away. does anyone have any clues on a clean way to do this, or is it going to have to be the long way round of writing some code in displayTable.asp to 'manually' call displayTable.php and return the results from that?

oh, also, am i right in thinking that Scheduled Tasks is the only windows server equivalent of linux cron jobs, or is there some other standard place i should be looking for such automated things?

thanks for reading and sorry for length!
 
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