mysqli::debug

mysqli_debug

(PHP 5, PHP 7, PHP 8)

mysqli::debug -- mysqli_debug — Performs debugging operations

说明

面向对象风格

public mysqli::debug(string $options): true

过程化风格

mysqli_debug(string $options): true

Performs debugging operations using the Fred Fish debugging library.

参数

options

A 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>
Each field consists of a mandatory flag character followed by an optional , and comma separated list of modifiers: flag[,modifier,modifier,...,modifier]

Recognized Flag Characters
options 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

返回值

总是返回 true。

更新日志

版本 说明
8.0.0 This function now always returns true. Previously it returned false on failure.

示例

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");

?>

注释

注意:

To use the mysqli_debug() function you must compile the MySQL client library to support debugging.

参见