Not entirely true, there are some 7.1+ extensions that make the mssql_connect work. But many of the extensions come with a warning, that due to compatability problems they may not function the exact same was as the 5.2 binaries of php did.
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ejay1588 you can alternatively re-write the php to use sqlsrv instead, this is the newer and improved version of mssql for php. It works in almost the same way as mssql and isn't difficult to re-write too. I would however severely advise against using mssql_connect as there are a ton of flaws in mssql_connect that can be exploited.