mysqli_debug Performs debugging operations boolmysqli_debug stringdebug 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. &reftitle.returnvalues; mysqli_debug doesn't return any value. &reftitle.seealso; mysqli_dump_debug_info&listendand; mysqli_report. &reftitle.examples; ]]>