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(PECL maxdb >= 1.0)
maxdb_debug — Performs debugging operations
$debug 
   )The maxdb_debug() can be used to trace the SQLDBC communication. The following strings can be used as a parameter to maxdb_debug() :
maxdb_debug() doesn't return any value.
Example #1 过程化风格
  <?php
maxdb_debug ( "trace packet 200" );
 $link  =  maxdb_connect ( "localhost" ,  "MONA" ,  "RED" ,  "DEMODB" );
 
 if (! $link ) {
    printf ( "Connect failed: %s\n" ,  maxdb_connect_error ());
   exit();
}
 
 maxdb_close ( $link );
 ?>   The above example produces no output.