nested array...

hi, i have a nested array
ex:
print_r($nestedarray):
Array(
[0]=>Array([id]=>1 [name]=>name1 [etc]=>etc1)
[1]=>Array([id]=>2 [name]=>name2 [etc]=>etc2)
[3]=>Array([id]=>3 [name]=>name3 [etc]=>etc3)
)

if I want to check whether id=5 is in that $nestedarray, how to do that?!?!

i'd really appreciate the help..

thanks in advance..