MAC OS and php newby

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Just purchased mac mini and upgraded to Tiger 10.4.  I want to create a
small web app with php that links up with a mySQL db.  I have mySQL
installed and php installed.  Problem is, I do not know how to create a
file with a php extension (e.g. info.php).  I thought developer tools
xCode2 came standard with Tiger, but TextEdit does not allow php
extensions.  I think I have already configured Apache to work with php
Any thoughts?

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