mysqli_debug
    (PHP 5)
mysqli_debug -- Performs debugging operations
Description
bool 
mysqli_debug ( string debug )
     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.
    
Note: 
      To use the mysqli_debug() function you must complile
      the MySQL client library to support debugging.
     
Return Values
mysqli_debug() doesn't return any value.
Examples
     
Example 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");      ?>
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