(PHP 5, PHP 7, PHP 8)
mysqli::debug -- mysqli_debug — Performs debugging operations
面向对象风格
$options): bool过程化风格
$options): boolPerforms debugging operations using the Fred Fish debugging library.
optionsA string representing the debugging operation to perform
The debug control string is a sequence of colon separated fields as follows:
<field_1>:<field_2>:<field_N>, and comma separated list of modifiers:
flag[,modifier,modifier,...,modifier]
option character |
Description |
|---|---|
| O | MYSQLND_DEBUG_FLUSH |
| A/a | MYSQLND_DEBUG_APPEND |
| F | MYSQLND_DEBUG_DUMP_FILE |
| i | MYSQLND_DEBUG_DUMP_PID |
| L | MYSQLND_DEBUG_DUMP_LINE |
| m | MYSQLND_DEBUG_TRACE_MEMORY_CALLS |
| n | MYSQLND_DEBUG_DUMP_LEVEL |
| o | output to file |
| T | MYSQLND_DEBUG_DUMP_TIME |
| t | MYSQLND_DEBUG_DUMP_TRACE |
| x | MYSQLND_DEBUG_PROFILE_CALLS |
Returns true.
示例 #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");
?>
注意:
To use the mysqli_debug() function you must compile the MySQL client library to support debugging.