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:

LOG_CONS
LOG_NDELAY
LOG_ODELAY
LOG_NOWAIT
LOG_PERROR
LOG_PID

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:

LOG_AUTH
LOG_AUTHPRIV
LOG_CRON
LOG_DAEMON
LOG_KERN
LOG_LOCAL[0-7]
LOG_LPR
LOG_MAIL
LOG_NEWS
LOG_SYSLOG
LOG_USER
LOG_UUCP

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

syslog() - Generate a system log message
closelog() - 关闭系统日志链接

发现了问题？

了解如何改进此页面 • 提交拉取请求 • 报告一个错误

＋添加备注

用户贡献的备注 1 note

down

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));
    }
}
?>

＋添加备注

官方地址：https://www.php.net/manual/en/function.openlog.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言开发编程 Linux 科技 Elasticsearch HTML/CSS/XML 面试数据库网络 JAVA NoSQL C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Windows Vim Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器 Docker

docker-compose启动nginx与php-fpm composer install参数 php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 Composer的Packagist资源 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 PHP 8.1 PHP json解析（json_decode）页面工具 opcache预加载 php $_SERVER中的SERVER_NAME 和HTTP_HOST的区别 mysql面试题 composer基本用法 php 将字符串中的连续多个空格转换为一个空格 html转义/html编码/html解码两千行PHP学习笔记 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式常用的php ADODB使用方法集锦 Packagist / Composer 中国全量镜像

略微加速

PHP官方手册 - 互联网笔记

openlog

说明

参数

返回值

更新日志

参见

发现了问题？

用户贡献的备注 1 note