Start by doing a var_dump() or var_export() of the array you want to search, to make sure it has the expected structure. If at that point it's still not obvious what you need to do, then copy/paste the output here and tell us what the expected output is for that example data. Otherwise we're just guessing.
// this should make it nicely formatted:
echo "<pre>".var_export($some_array, 1)."</pre>";