(PHP 5, PHP 7)
mysqli::debug -- mysqli_debug — Performs debugging operations
Object oriented style
public mysqli::debug ( string $message ) : bool
Procedural style
mysqli_debug ( string $message ) : bool
Performs debugging operations using the Fred Fish debugging library.
message
A string representing the debugging operation to perform
Returns true.
Note:
To use the mysqli_debug() function you must compile the MySQL client library to support debugging.
Example #1 Generating a Trace File
<?php
/* Create a trace file in '/tmp/client.trace' on the local (client) machine: */
mysqli_debug("d:t:o,/tmp/client.trace");
?>
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https://www.php.net/manual/en/mysqli.debug.php