Description:
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See reproduce code. The query is executed 2 times on resource $r2.

Reproduce code:
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$r1 = mssql_connect('my_server', 'my_user', 'my_pass');
mssql_select_db('database_1', $r1);

$r2 = mssql_connect('my_server', 'my_user', 'my_pass');
mssql_select_db('database_2', $r2);

$sSql = 'select count(*) as total from my_table';

$rRes1 = mssql_query($sSql, $r1);
$oRow1 = mssql_fetch_object($rRes1);
echo '1:   '.$oRow1->total.'<br>';

$rRes2 = mssql_query($sSql, $r2);
$oRow2 = mssql_fetch_object($rRes2);
echo '2:   '.$oRow2->total.'<br>';

Expected result:
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Different total.

Actual result:
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Same total.