Other changes to extensions
  
   Changes in extension behavior, and new features:
  
  
  
   - 
    
     pdo_mysql
     - Removed support for linking with MySQL client libraries older than 4.1
    
   
   - 
  
   The MySQL extensions mysql,
   mysqli and PDO_mysql
   use mysqlnd as the default library now. It is still possible to use
   libmysqlclient by specifying a path to the configure options.
    
  
   - 
    
     mysqlnd
     - Added named pipes support