portal reccomendations

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I am just getting into PHP, and working my way through a good book. But I  
need some reccomendations.

I am contemplating ways to receive job applications on the web...

Is there some open-source PHP Nuke-like (portal?) tool that would allow me  
to give users an individual username/password so they could:

1. Enter their contact info and add a resume
2. Come back later and update any changed info, including upload a new  

Any reccomendations would be great.  

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