在Linux上使用命令行PHP检查Internet连接 [英] Checking internet connection with command-line PHP on linux

问题描述

我正在Linux上使用命令行PHP来打开蓝牙拨号连接，并且我需要一种快捷的方法来检查Internet连接是否处于活动状态.好吧，不必脏，但很快就会受到赞赏.:)使用 exec 运行外部命令不是问题.

I'm using command-line PHP on linux to open bluetooth dialup connection, and I need a quick'n'dirty way to check if internet connection is active. Well, doesn't have to be dirty, but quick is appreciated. :) Using exec to run external commands is not a problem.

我正在考虑ping一些稳定的服务器(例如google)，但我想知道是否有更好的方法.也许检查 ifconfig 的输出?自然而然，最好的命令是响应明确的响应，例如(无法连接到服务器"，已连接").想法?

I'm thinking of pinging some stable server (e.g. google), but I'm wondering if there's some better way. Maybe checking output of ifconfig? A command that would respond with a clear response like ("cannot connect to server","connected") would naturally be best. Ideas?

推荐答案

如果您希望某些东西可以在不依赖外部服务器的情况下工作，则可以检查默认路由.此命令将打印出默认路由的数量:

If you want something that'll work without relying on an outside server, you can check for a default route. This command will print out the number of default routes:

/sbin/route -n | grep -c '^0\.0\.0\.0'

如果它是 0 ，则无法进入外界.

If it's 0, you can't get to the outside world.

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