检测php版本：
php -v
php --version显示如下：
PHP 8.1.12 (cli) (built: Oct 26 2022 10:00:44) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.1.12, Copyright (c) Zend Technologies
with Zend OPcache v8.1.12, Copyright (c), by Zend Technologies使用curl命令查看web server给出的http头信息
curl -IL https://你的域名/
显示如下：
HTTP/2 200
server: nginx
date: Sun, 23 Jun 2019 20:48:48 GMT
content-type: text/html; charset=UTF-8
x-powered-by: PHP/8.1.12
expires: Thu, 19 Nov 1981 08:52:00 GMT
cache-control: no-store, no-cache, must-revalidate
pragma: no-cache
x-robots-tag: noindex, noarchive
strict-transport-security: max-age=15768000
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
x-whome: l-cbz01
referrer-policy: no-referrer-when-downgrade上面红色的部分，我们要想办法隐藏起来，在php中要进行参数设置，但是我推荐你自定义一个配置文件custom.ini，不要用php.ini ，有很多种情况会覆盖它。
下面的经验你直接采用即可：
- Alpine Linux and PHP v5.6.xx : /etc/php5/conf.d/custom.ini
- Alpine Linux and PHP v7.xx : /etc/php7/conf.d/custom.ini (for PHP 8.1.xx edit the /etc/php81/conf.d/custom.ini)
- Debian/Ubuntu Linux and PHP v7.xx : /etc/php/7.0/fpm/conf.d/custom.ini
- RHEL/Fedora/CentOS Linux : /etc/php.d/custom.ini
- OpenSUSE or SUSE Linux : /etc/php7/conf.d/custom.ini
但是自己服务器的php配置目录在哪里呢？给你多个命令方法：
php -i | more
php -i | grep -i -A4 'Additional .ini files parsed'
php-fpm5 -i | grep -i -A4 'Additional .ini files parsed'
php-fpm7.0 -i | grep -i -A4 'Additional .ini files parsed'
php-fpm8.0 -i | grep -i -A4 'Additional .ini files parsed'比如我的结果如下：
Configuration File (php.ini) Path => /etc/php/7.0/fpm
Loaded Configuration File => /etc/php/7.0/fpm/php.ini
Scan this dir for additional .ini files => /etc/php/7.0/fpm/conf.d
Additional .ini files parsed => /etc/php/7.0/fpm/conf.d/10-mysqlnd.ini,
/etc/php/7.0/fpm/conf.d/10-opcache.ini,
/etc/php/7.0/fpm/conf.d/10-pdo.ini,那现在就来生成一个自己的custom.ini文件吧：
##############################################
## this is for Alpine Linux and PHP v5.6.xx ##
##############################################
echo 'expose_php = off' >> /etc/php5/conf.d/custom.ini如果你使用 Alpine Linux and PHP 7.x:
echo 'expose_php = off' >> /etc/php7/conf.d/custom.ini接下来重启你的php服务吧，取决你的版本，下面是很多个例子参考：
### [ Alpine linux restart php-fpm ] ##
sudo /etc/init.d/php-fpm restart
### [ RHEL/CentOS 5.x/6.x restart php-fpm ] ##
sudo service php-fpm restart
### [ RHEL/CentOS 7.x restart php-fpm ] ##
sudo systemctl restart php-fpm
### [ Debian/Ubuntu Linux latest restart php-fpm ] ##
sudo service php7.0-fpm restart
### [ FreeBSD restart php-fpm ] ##
sudo service php-fpm restart
### [ Alpine Linux restart php-fpm7/php-fpm81 ] ##
sudo /etc/init.d/php-fpm7 restart
sudo /etc/init.d/php-fpm81 restart
### [ SUSE/OpenSUSE Linux restart php-fpm7 ] ##
sudo systemctl restart php-fpm.service好了，再次用 curl -IL https://你的域名/ 来验证，比如我的例子：
HTTP/2 200
server: nginx
date: Sun, 23 Jun 2019 20:56:01 GMT
content-type: text/html; charset=UTF-8
set-cookie: PHPSESSID=q49sd1armm17j7a8l658538n74; path=/
expires: Thu, 19 Nov 1981 08:52:00 GMT
cache-control: no-store, no-cache, must-revalidate
pragma: no-cache
x-robots-tag: noindex, noarchive
strict-transport-security: max-age=15768000
x-content-type-options: nosniff
x-frame-options: SAMEORIGIN
x-xss-protection: 1; mode=block
x-whome: l-cbz01
referrer-policy: no-referrer-when-downgrade看看到了吧，上面没有php的版本号了，你甚至可以用nmap来扫描验证：
nmap -sV --script=http-php-version server-ip-here
nmap -sV --script=http-php-version结果：
Starting Nmap 7.70 ( https://nmap.org ) at 2019-06-24 02:26 IST
Nmap scan report for newsletter.cyberciti.biz (96.126.119.5)
Host is up (0.26s latency).
rDNS record for 96.126.119.5: nb-96-126-119-5.dallas.nodebalancer.linode.com
Not shown: 998 closed ports
PORT STATE SERVICE VERSION
80/tcp open http nginx
|_http-server-header: nginx
443/tcp open ssl/http nginx
|_http-server-header: nginx
Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 21.20 seconds