新购入一台阿里云服务器，系统版本是CentOS 7.4，以下是搭建PHP环境的步骤

一、部署yum源

1、打开centos的yum文件夹

输入命令cd /etc/yum.repos.d/

2、用wget下载repo文件

输入命令wget http://mirrors.aliyun.com/repo/Centos-7.repo
如果wget命令不生效，说明还没有安装wget工具，输入yum -y install wget回车进行安装。
当前目录是/etc/yum.repos.d/，刚刚下载的Centos-7.repo也在这个目录上

3、备份系统原来的repo文件

mv CentOS-Base.repo CentOS-Base.repo.bak

即是重命名 CentOS-Base.repo -> CentOS-Base.repo.bak

4、替换系统原理的repo文件

mv Centos-7.repo CentOS-Base.repo

即是重命名 Centos-7.repo -> CentOs-Base.repo

5、执行yum源更新命令

yum clean all
yum makecache
yum update

但是阿里云的源有时候缺很多东西
可以继续安装其他源
安装epel源

yum install epel-release 

安装remi源

yum install -y http://rpms.famillecollet.com/enterprise/remi-release-7.rpm

然后进入到/etc/yum.repos.d/目录看一下源列表

yum repolist

二、yum源配好了下面就可以安装软件了

1、先随便安装个vim测试一下

yum install vim

下面开始安装PHP环境

2、安装PHP

通过search搜索合适的PHP源

yum search php7

这时候会列出一堆带php7的源，如果想更详细可以选php72或者php73等版本，如果发现没有从remi源里搜索
可以加上选择什么源

yum --enablerepo=remi search <keyword>

可以通过yum info <包名>查看包的具体版本等信息
依次执行安装php

yum install php73
yum install php73-php-fpm

3、安装nginx，发现源里面的nginx版本比较旧，通过以下方式安装新的

wget  http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm
rpm -ivh nginx-release-centos-7-0.el7.ngx.noarch.rpm
yum install nginx

4、接下来安装mysql

首先centOS 7 自带一个mariadb，需要卸载掉，否则会跟mysql冲突

rpm -qa | grep mariadb          //列出来服务器上安装的mariadb包
rpm -e --nodeps mariadb-libs-5.5.56-2.el7.x86_64         //移除掉安装的包（包名从刚才的列表里粘贴）

依然是和nginx类似的步骤获取比较新的mysql 5.7版本

wget http://repo.mysql.com//mysql57-community-release-el7-7.noarch.rpm
rpm -Uvh mysql57-community-release-el7-7.noarch.rpm
yum install mysql-community-server  //安装服务端

mysql5.7之后的版本为了安全起见会随机生成一个初始密码放在/var/log/mysqld.log?
找到日志中的

> A temporary password is generated for root@localhost:

之类就是初始密码。
修改mysql密码
拿到初始密码之后，登录mysql修改密码

mysql -u root -p

• 1: 修改密码，必须有大小写，含数字特殊符号，长度8位及以上
  > SET PASSWORD = 'your password';
• 2: 设置密码不过期；
  > ALTER USER root@localhost PASSWORD EXPIRE NEVER;
• 3: 刷新权限表;
  > flush privileges;
  然后打开nginx配置目录
  新建pksfc.conf

server {
    listen       80;
    server_name  www.pksfc.com;
    root         /var/www/html;
    # Load configuration files for the default server block.
    include /etc/nginx/default.d/*.conf;

    location / {
        index  index.html;
                if (!-e $request_filename) {
                    rewrite  ^(.*)$  /404.html  last;
                    break;
                }
                error_page 404  /var/www/html/404.html;
    }
    location ~ \.php(.*)$ {
                fastcgi_pass 127.0.0.1:9000;
                #fastcgi_pass   unix:/var/run/php-fpm.sock;
                fastcgi_index  index.php;
                fastcgi_split_path_info  ^((?U).+\.php)(/?.+)$;
                fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
                fastcgi_param  PATH_INFO  $fastcgi_path_info;
                fastcgi_param  PATH_TRANSLATED  $document_root$fastcgi_path_info;
                include        fastcgi_params; 
                fastcgi_keep_conn on;
                fastcgi_connect_timeout      180;
                fastcgi_read_timeout         600;
                fastcgi_send_timeout         600;
                fastcgi_buffer_size          128k;
                fastcgi_buffers 8 64k;
                fastcgi_busy_buffers_size 256k;
                fastcgi_temp_file_write_size 256k;
        }
}
server {
    listen        443 ssl http2;
    server_name  www.pksfc.com;
    root /var/www/html;
    ssl                  on;
    ssl_certificate      /etc/nginx/1_www.pksfc.com_bundle.crt;
    ssl_certificate_key  /etc/nginx/2_www.pksfc.com.key;

    ssl_ciphers                     HIGH:!aNULL:!MD5;
    ssl_session_timeout             5m;
    ssl_protocols                   TLSv1 TLSv1.1 TLSv1.2;
    ssl_prefer_server_ciphers       on;
    ssl_dhparam /etc/nginx/ssl/dhparam.pem;
    add_header Strict-Transport-Security "max-age=31536000; includeSubdomains; preload";
    add_header               X-Frame-Options SAMEORIGIN;
    add_header               X-Content-Type-Options nosniff;
    
    location / {
                index  index.html;
                if (!-e $request_filename) {
                        rewrite  ^(.*)$  /404.html  last;
                        break;
                }
                error_page 404  /var/www/html/404.html;
    }
    location ~ \.php(.*)$ {
                 fastcgi_pass 127.0.0.1:9000;
                #fastcgi_pass   unix:/var/run/php-fpm.sock;
                #fastcgi_index  index.php;
                fastcgi_split_path_info  ^((?U).+\.php)(/?.+)$;
                fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
                fastcgi_param  PATH_INFO  $fastcgi_path_info;
                fastcgi_param  PATH_TRANSLATED  $document_root$fastcgi_path_info;
                #include        fastcgi_params;

        fastcgi_index                index.php;
        fastcgi_connect_timeout      180;
        fastcgi_read_timeout         600;
        fastcgi_send_timeout         600;
        fastcgi_buffer_size          128k;
        fastcgi_buffers 8 64k;
        fastcgi_busy_buffers_size 256k;
        fastcgi_temp_file_write_size 256k;
        #fastcgi_param   SCRIPT_FILENAME $request_filename;
        include         fastcgi_params;
        fastcgi_keep_conn on;
        
        }
}

然后restart nginx之后就可以通过域名去访问了
如果想设置开机自启动的话就执行下面的语句

chkconfig nginx on
chkconfig php72-php-fpm on
chkconfig supervisord on

5、最后一步补充PHP扩展，当你发现缺少了某些扩展的时候依然是通过以下命令

yum search php-mysql
yum install -y php73-php-mysqlnd.x86_64
service php73-php-fpm restart

去搜索安装对应扩展并重启php-fpm服务
其他的如redis，mongodb，等参考上面例子安装即可
大功告成！！！