Self generating variables/arrays

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Hello;
I am writing some code that will format results of a search for display.
I need to split an array into several different arrays but I won't know
before hand how many, so, I am looking for a way to dynamically
generate arrays for this purpose.
My present direction is to use the following code:

for($i = 0; $i < $c; $i++)
    { eval('$a_'.$i.' = array();'); }

Where '$c' is the derived number of arrays need to hold the
pieces of the bigger array. My confusion, though, is; since
these are created in the scope of the for loop, I don't know
if I can use them elsewhere in the code. The Global statement
sends them outside the scope of the function this code is in,
or does it? And I'm not even sure I am on the right track.
Perhaps someone can say yay or nay on the spot, if not
I can go back and do some experimenting.
Thanks in advance
Jeff K

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