1、打印phpinfo()查看是否已经安装sockets，如果没有请按照以下方式安装：cd /home/vagrant/php-7.4.2/ext/sockets/usr/local/php/bin/phpize./configure --with-php-config=/usr/local/php/bin/php-configmakemake install然后修改php.ini：extension=sockets重启php-fpm
2、新建php文件，编辑内容如下：<?php$ip='127.0.0.1';$port=80;$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP); socket_set_nonblock($sock); socket_connect($sock,$ip, $port); socket_set_block($sock); $return = @socket_select($r = array($sock), $w = array($sock), $f = array($sock), 3); socket_close($sock);var_dump($return);
4、我们使用linux命令查询服务器所有开启的端口号：
