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(PECL mysqlnd-uh >= 1.0.0-alpha)
MysqlndUhConnection::close — Closes a previously opened database connection
$connection 
   ,  int $close_type 
   )Closes a previously opened database connection.
Note:
Failing to call the parent implementation may cause memory leaks or crash PHP. This is not considered a bug. Please, keep in mind that the mysqlnd library functions have never been designed to be exposed to the user space.
connection The connection to be closed. Do not modify!
close_type 
      Why the connection is to be closed. The value
      of close_type is one of
       MYSQLND_UH_MYSQLND_CLOSE_EXPLICIT ,
       MYSQLND_UH_MYSQLND_CLOSE_IMPLICIT ,
       MYSQLND_UH_MYSQLND_CLOSE_DISCONNECTED  or
        MYSQLND_UH_MYSQLND_CLOSE_LAST . The
       latter should never be seen, unless the default
       behaviour of the mysqlnd library
       has been changed by a plugin.
     
   Returns  TRUE  on success.
   Otherwise, returns  FALSE  
Example #1 MysqlndUhConnection::close() example
  <?php
 function  close_type_to_string ( $close_type ) {
  $mapping  = array(
   MYSQLND_UH_MYSQLND_CLOSE_DISCONNECTED  =>  "MYSQLND_UH_MYSQLND_CLOSE_DISCONNECTED" ,
   MYSQLND_UH_MYSQLND_CLOSE_EXPLICIT  =>  "MYSQLND_UH_MYSQLND_CLOSE_EXPLICIT" ,
   MYSQLND_UH_MYSQLND_CLOSE_IMPLICIT  =>  "MYSQLND_UH_MYSQLND_CLOSE_IMPLICIT" ,
   MYSQLND_UH_MYSQLND_CLOSE_LAST  =>  "MYSQLND_UH_MYSQLND_CLOSE_IMPLICIT"
  );
 return (isset( $mapping [ $close_type ])) ?  $mapping [ $close_type ] :  'unknown' ;
}
class  proxy  extends  MysqlndUhConnection  {
  public function  close ( $res ,  $close_type ) {
    printf ( "%s(%s)\n" ,  __METHOD__ ,  var_export ( func_get_args (),  true ));
    printf ( "close_type = %s\n" ,  close_type_to_string ( $close_type ));
    
    $ret  =  parent :: close ( $res ,  $close_type );
    printf ( "%s returns %s\n" ,  __METHOD__ ,  var_export ( $ret ,  true ));
   return  $ret ;
 }
}
 mysqlnd_uh_set_connection_proxy (new  proxy ());
 $mysqli  = new  mysqli ( "localhost" ,  "root" ,  "" ,  "test" );
 $mysqli -> close ();
 ?>   以上例程会输出:
proxy::close(array ( 0 => NULL, 1 => 0, )) close_type = MYSQLND_UH_MYSQLND_CLOSE_EXPLICIT proxy::close returns true