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

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