Description:
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I have a script connecting to a Sybase Adaptive Server Anywhere 9. I iterate through the resultset like this:

while($row = odbc_fetch_array($res)) {
...
}

Sometimes when I try to fetch a large resultset the odbc_fetch_array returns false and the loop stops when there are more rows. The only way I can fetch all rows is to set the second argument to odbc_fetch_array where I force the function  to fetch a specific row. To get the actual number of rows I have to run a sql and count the number of rows before I get the resultset.

I'm not sure that this is a PHP problem, it could be the odbc driver or something else. But I don't know how to solve the problem or debug it further.