Notes
 
  This section provides a collection of miscellaneous notes on MySQL
  Native Driver usage.
 
 
   Using mysqlnd means using PHP streams 
   for underlying connectivity. For mysqlnd, the PHP 
   streams documentation (Streams) should be consulted 
   on such details as timeout settings, not the documentation for the MySQL 
   Client Library.
 
 
 
 
  
User Contributed Notes
 
  
  
   Les Brown
   23-Feb-2010 11:04
   
    
After upgrading from php 5.2 to php 5.3 on Windows, I was unable to connect to MySQL databases on localhost. I eventually tracked the problem down to entries in my hosts file:
It contained:
127.0.0.1       localhost
[...]
::1             localhost
Commenting out the second line fixed the problem.
The problem is explained here: http://bugs.php.net/bug.php?id=50172