Since I upgraded from 4.23 to 4.3.0RC2 PHP is causing a lot of SQL-trouble. We are using MS SQL-Server 2000/IIS/Win2000Server/PHP4.3.0-ORC2(isapi). 

The trouble mainly is caused by using the UPDATE statement. Example: 

	$statement = "
UPDATE table1 
SET name1 = 'anything' 
WHERE name1 = 'something'
	";
	mssql_query($statement,$dbh);

Returns 'PHP has encountered an Access Violation at 01A95154' in the browser window but the PHP-script dows not execute anything after the query. 
Strange enough a check of the database shows the query itself being successful. 

If I now replace 
	mssql_query($statement,$dbh);
with 
	$var = mssql_query($statement,$dbh);
the script continues working and everything seems to be ok. 

But having an update statement in a loop you will have to change the name of the variable (called $var above), otherwise this fails after the first loop. 
Further problems occuring with mssql-queries in selfdefined functions ... the above workaround seems not to work in functions.