Interbase and php

Hi, I use Interbase 6.01 in a Linux system and i want use php for my server side language for accessing the Interbase database. When i start to use php for accessing database i seen that i can't move my row pointer (cursor) into a quey after i use ibase_query() function. Only traverse one row at a time. I can't repositioning to the first row, for example. How i can point to the first row of a query in php with Interbase without requery the data ? Thank.