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(PECL maxdb >= 1.0)
maxdb_connect_errno — Returns the error code from last connect call
The maxdb_connect_errno() function will return the last error code number for last call to maxdb_connect() . If no errors have occurred, this function will return zero.
An error code value for the last call to maxdb_connect() , if it failed. zero means no error occurred.
Example #1 maxdb_connect_errno sample
  <?php
$link  =  maxdb_connect ( "localhost" ,  "XXXXXXXX" ,  "YYYYYYYYY" );
if (! $link ) {
    printf ( "Can't connect to localhost. Errorcode: %d\n" ,  maxdb_connect_errno ());
}
 ?>   以上例程的输出类似于:
PHP Warning: maxdb_connect(): -4008 POS(1) Unknown user name/password combination [08004] <...> Can't connect to localhost. Errorcode: -4008