(PHP 5 CVS only)
The mysqli_debug() function is used to perform debugging
operations using the Fred Fish debugging library. The debug
parameter is a string representing the debugging operation to perform.
To use the mysqli_debug() function you must complile
the MySQL client library to support debugging.
mysqli_debug() doesn't return any value.
例子 1. Generating a Trace File
<?php /* Create a trace file in '/tmp/client.trace' on the local (client) machine: */mysqli_debug("d:t:0,/tmp/client.trace"); ?>