Your question isn't clear. If you mean "can I have multidimensional arrays?" then the answer is yes. Just use notation like this:
$a[row][column]='value';
You can also put arrays inside other arrays:
$b=array('val1','val2',$val3);
$a[x]=$b;
This has slightly different uses and implications, but still results in two dimensional storage.
Now, what were you really trying to ask?