Procedural style:
Object oriented style (method):
mysqli { bool debug(string message);}
bool debug(string message);
Performs debugging operations using the Fred Fish debugging library.
A string representing the debugging operation to perform
Returns TRUE.
TRUE
To use the mysqli_debug() function you must complile the MySQL client library to support debugging.
<?php/* Create a trace file in '/tmp/client.trace' on the local (client) machine: */mysqli_debug("d:t:0,/tmp/client.trace");?>