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    openlog

    (PHP 4, PHP 5, PHP 7, PHP 8)

    openlog — Open connection to system logger

    说明

    openlog(string $prefix, int $flags, int $facility): true

    openlog() opens a connection to the system logger for a program.

    The use of openlog() is optional. It will automatically be called by syslog() if necessary, in which case prefix will default to the empty string.

    参数

    prefix

    The string prefix is added to each message.

    flags

    Bitmask of the following constants:

    facility

    The facility argument is used to specify what type of program is logging the message. This lets the configuration file specify that messages from different facilities will be handled differently. Must be one of the following constants:

    注意: This parameter is ignored on Windows.

    返回值

    总是返回 true。

    更新日志

    版本 说明
    8.2.0 The function now always returns true. Previously it returned false on failure.

    参见

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    Nimja
    11 years ago
    To those curious; switching between different facilities is NOT an issue. There is no apparent memory overhead (nor slowdown) by calling openlog multiple(12 * 10000) times.

    Shown by this example:

    <?php
    $facilities     = array(
    LOG_AUTH,
    LOG_AUTHPRIV,
    LOG_CRON,
    LOG_DAEMON,
    LOG_KERN,
    LOG_LOCAL0,
    LOG_LPR,
    LOG_MAIL,
    LOG_NEWS,
    LOG_SYSLOG,
    LOG_USER,
    LOG_UUCP,
    );

    for (    $i = 0; $i < 10000; $i++) {
    foreach (    $facilities as $facility) {
    openlog('test', LOG_PID, $facility);
    syslog(LOG_ERR, "This is a test: " . memory_get_usage(true));
    }
    }
    ?>
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