You need a content management system and yes many/most of these are written in PHP. I use one called Website Baker because I find it is the easiest to understand and use, for me, and for those who maintain the websites that I build for them. If you want to check out what's out there, you can also look at Joomla, Drupal, Mambo and Workpress and a whole bunch of others that are less well known.
Chris
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