Walking through an array

I'm reading PHP & MySQL for Dummies 2nd edition...ya ya I know..lame.
Anyway I got to the part about walking through an array and I just can't
seem to figure out what this would be used for. What is the point of this?
When would you use this? It says in great detail how to do it but it's
missing the the why and where.

Any help would be greatly appreciated.
Jon



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