Description:
------------
Hi,
I am disappointed about the way PHP communicates with MS SQL Server and handles queries. I costed me more than a week to find out this. Basically, it is related to BIGINT data types, I guess.
Here is the test case:
Have a simple table including a field of type bigint.
Have a procedure reading data from it, returning an output field of type bigint and a resultset on the fly.
Have a simple SQL statement to declare a temp variable of type bigint, calling this procedure and getting the output.
Use this through mssql_query() function.
Have another simle select query.
I expect 2 resultsets from the 1st query (2 values output) and another from the 2nd query.
But I have 1 resultset from the 1st query (1 value)
and a failure for a correct SQL statement.
Because it is understood that connection is lost somehow during the 1st query without any error message.
If you change every BIGINT to INT it works fine.
However, I do NOT think this is the solution.

Reproduce code:
---------------
--sql statements to prepare database

CREATE TABLE [T1] (
  [id] bigint NOT NULL,
  [name] nvarchar(50) NOT NULL,
  PRIMARY KEY CLUSTERED ([id])
)
GO

INSERT INTO [T1] ([id], [name])
VALUES 
  (1, 'abc')
GO

INSERT INTO [T1] ([id], [name])
VALUES 
  (2, 'def')
GO

CREATE PROCEDURE my_proc
   @output1 bigint output
AS
BEGIN
  --set the value
  select top 1
        @output1 = id
  from  t1

  --return recordset for php
  select @output1 as MY_BIG_INT_output1
  
END
GO

--end of sql


<?php
//PHP file:

if($dbh = mssql_connect('host\sqlserver', 'dba', 'pwd')){
	echo 'Host connected<br>';
  if(mssql_select_db('mydb')){
     echo 'Database selected!<br>';

     $input1=2;
     $sql ="
          DECLARE @o BIGINT
          EXECUTE my_proc @o output
          SELECT @o as output2
          "
         ;
     echo 'Running SQL:<br><pre>'.$sql.'</pre>'; 
     //if there is an emp record 
     //  there will be 3 result sets: emp, return_value, output1
     //else
     //  there will be 2 result sets: return_value, output1
     if($rs = mssql_query($sql)){
        do{
          while($row = mssql_fetch_assoc($rs)){
    	      echo '<pre>'.print_r($row,true).'</pre>';
          }
        } while(mssql_next_result($rs));
        mssql_free_result($rs);
     }else{
        echo 'Error: '.mssql_get_last_message().'<br>';
     }
    
     //try another query
     $sql2='SELECT TOP 1 * FROM t1';
     echo 'Running SQL:<br><pre>'.$sql2.'</pre>';
     if($rs2 = mssql_query($sql2)){
        while($row2 = mssql_fetch_assoc($rs2)){
          echo '<pre>'.print_r($row2,true).'</pre>';
        }
        mssql_free_result($rs2);
     }else{
        echo 'Error: '.mssql_get_last_message().'<br>';
     }
  }else{
    echo 'Database selection failed!';
  }//end if select db
  mssql_close($dbh);
}else{
  echo 'Host connection failed!';
}//end if connection

//end of PHP file
?>

Expected result:
----------------
Host connected
Database selected!
Running SQL:

          DECLARE @o bigint
          EXECUTE my_proc @o output
          SELECT @o as output2
          
Array
(
    [MY_BIG_INT_output1] => 1
)

Array
(
    [output2] => 1
)

Running SQL:

SELECT TOP 1 * FROM t1
Array
(
    [id] => 1
    [name] => abc
)

//// or an error message/warning if a particular datatype is not supported, etc.


Actual result:
--------------
Host connected
Database selected!
Running SQL:

          DECLARE @o bigint
          EXECUTE my_proc @o output
          SELECT @o as output2
          
Array
(
    [MY_BIG_INT_output1] => 1
)

Running SQL:

SELECT TOP 1 * FROM t1

Warning: mssql_query() [function.mssql-query]: Unable to set query in ...test_proc.php on line 34
Error: