deal with form_input(). Miss parameter.

[eluser]dimaomni[/eluser]
Dear coders.
Don't know what is wrong:

php:
form_input('name['.$students->id.']','','maxlength="2"','size="2"');

result is html:
<input type="text" maxlength="2" value="" name="name[1]">

when I've changed maxlength and size result was like :
<input type="text" size="2" value="" name="name[1]">

I've tried changed parameters placement, but without success.

Thanks!