1:進入終端後查看PHP版本
php -v
輸出可能如下：
PHP 5.4.35 (cli) (built: Nov 14 2014 07:04:10) Copyright (c) 1997-2014 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2015 Zend Technologies with Zend OPcache v7.0.4-dev, Copyright (c) 1999-2015, by Zend Technologies
2:執行下面的命令升級軟體倉庫
rpm -Uvh https://mirror.webtatic.com/yum/el7/epel-release.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
3:執行下面的命令刪除php
yum remove php-common
然後像安裝那樣問你是否繼續的，輸入yes即可
4:安裝php 5.6版本（php56w-devel這個不是必需的）
yum install -y php56w php56w-opcache php56w-xml php56w-mcrypt php56w-gd php56w-devel php56w-MySQL php56w-intl php56w-mbstring
5:重啟httpd
service httpd restart
查看最新的版本
php -v
現在應該是5.6了！
㈡ 阿里雲上的centos 7.2怎麼yum安裝php 5.6
因之前通過網易的 centos 鏡像，將阿里雲的 centos 升級到最新版了，乘自己的項目尚未開始正式開發，遂將所有的相應環境都升級到最高。
查看 centos 版本：
[root@iZ23d ~]# cat /etc/centos-release
CentOS Linux release 7.2.1511 (Core)
1、刪除之前的 php 版本：
[root@iZ23d ~]# yum remove php* php-common
Loaded plugins: langpacks
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
No Match for argument: php-5.4.16
No Match for argument: php-5.4.16.tar.gz
No Match for argument: php-7.0.1RC1
No Match for argument: php-7.0.1RC1.tar.gz
No Match for argument: phpMyAdmin-4.4.0.tar.gz
No Match for argument: php-common
No Packages marked for removal
2、rpm 安裝 Php7 相應的 yum源：
[root@iZ23d ~]# rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
Retrieving https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
warning: /var/tmp/rpm-tmp.LhJKKR: Header V4 RSA/SHA1 Signature, key ID 62e74ca5: NOKEY
Preparing... ################################# [100%]
package webtatic-release-7-3.noarch is already installed
3、 直接yum安裝php7：
[root@iZ23d ~]# yum install php70w
Loaded plugins: langpacks
Repository base is listed more than once in the configuration
Repository updates is listed more than once in the configuration
Repository extras is listed more than once in the configuration
Repository centosplus is listed more than once in the configuration
Resolving Dependencies
--> Running transaction check
。。。 【省略】
Warning: RPMDB altered outside of yum.
Installing : php70w-common-7.0.0-1.w7.x86_64 1/3
Installing : php70w-cli-7.0.0-1.w7.x86_64 2/3
Installing : php70w-7.0.0-1.w7.x86_64 3/3
Verifying : php70w-7.0.0-1.w7.x86_64 1/3
Verifying : php70w-common-7.0.0-1.w7.x86_64 2/3
Verifying : php70w-cli-7.0.0-1.w7.x86_64 3/3
Installed:
php70w.x86_64 0:7.0.0-1.w7
Dependency Installed:
php70w-cli.x86_64 0:7.0.0-1.w7 php70w-common.x86_64 0:7.0.0-1.w7
Complete!
4、檢查 php 版本：
[root@iZ23d ~]# php -v
PHP 7.0.0 (cli) (built: Dec 2 2015 20:42:32) ( NTS )
Copyright (c) 1997-2015 The PHP Group
Zend Engine v3.0.0, Copyright (c) 1998-2015 Zend Technologies
[root@iZ23d2e6hoqZ ~]#
以上顯示安裝成功！
5、重啟 Apache，查看 phpinfo :
[root@iZ23d ~]# systemctl restart httpd.service
檢查phpinfo:
PHP Version 7.0.0
SystemLinux iZ23d 3.10.0-229.11.1.el7.x86_64 #1 SMP Thu Aug 6 01:06:18 UTC 2015 x86_64
Build DateDec 2 2015 20:43:38
Server APIApache 2.0 Handler
Virtual Directory Supportdisabled
Configuration File (php.ini) Path/etc
Loaded Configuration File/etc/php.ini
Scan this dir for additional .ini files/etc/php.d
Additional .ini files parsed/etc/php.d/bz2.ini, /etc/php.d/calendar.ini, /etc/php.d/ctype.ini, /etc/php.d/curl.ini, /etc/php.d/exif.ini, /etc/php.d/fileinfo.ini, /etc/php.d/ftp.ini, /etc/php.d/gettext.ini, /etc/php.d/gmp.ini, /etc/php.d/iconv.ini, /etc/php.d/json.ini, /etc/php.d/phar.ini, /etc/php.d/shmop.ini, /etc/php.d/simplexml.ini, /etc/php.d/sockets.ini, /etc/php.d/tokenizer.ini, /etc/php.d/xml.ini, /etc/php.d/zip.ini
PHP API20151012
PHP Extension20151012
Zend Extension320151012
Zend Extension BuildAPI320151012,NTS
PHP Extension BuildAPI20151012,NTS
Debug Buildno
Thread Safetydisabled
Zend Signal Handlingdisabled
Zend Memory Managerenabled
Zend Multibyte Supportdisabled
IPv6 Supportenabled
DTrace Supportenabled
Registered PHP Streamshttps, ftps, compress.zlib, php, file, glob, data, http, ftp, compress.bzip2, phar, zip
Registered Stream Socket Transportstcp, udp, unix, udg, ssl, sslv3, sslv2, tls, tlsv1.0, tlsv1.1, tlsv1.2
Registered Stream Filterszlib.*, string.rot13, string.toupper, string.tolower, string.strip_tags, convert.*, consumed, dechunk, bzip2.*, convert.iconv.*
This program makes use of the Zend Scripting Language Engine:
Zend Engine v3.0.0, Copyright (c) 1998-2015 Zend Technologies
Configuration
apache2handler
Apache VersionApache/2.4.6 (CentOS)
Apache API Version20120211
Server [email protected]
Hostname:Portxxxx.xxxxx.xxx:0
User/Groupapache(48)/48
Max RequestsPer Child: 0 - Keep Alive: on - Max Per Connection: 100
TimeoutsConnection: 60 - Keep-Alive: 15
Virtual ServerYes
Server Root/etc/httpd
Loaded Molescore mod_so http_core mod_access_compat mod_actions mod_alias mod_allowmethods mod_auth_basic mod_auth_digest mod_authn_anon mod_authn_core mod_authn_dbd mod_authn_dbm mod_authn_file mod_authn_socache mod_authz_core mod_authz_dbd mod_authz_dbm mod_authz_groupfile mod_authz_host mod_authz_owner mod_authz_user mod_autoindex mod_cache mod_cache_disk mod_data mod_dbd mod_deflate mod_dir mod_mpio mod_echo mod_env mod_expires mod_ext_filter mod_filter mod_headers mod_include mod_info mod_log_config mod_logio mod_mime_magic mod_mime mod_negotiation mod_remoteip mod_reqtimeout mod_rewrite mod_setenvif mod_slotmem_plain mod_slotmem_shm mod_socache_dbm mod_socache_memcache mod_socache_shmcb mod_status mod_substitute mod_suexec mod_unique_id mod_unixd mod_userdir mod_version mod_vhost_alias mod_dav mod_dav_fs mod_dav_lock mod_lua prefork mod_proxy mod_lbmethod_bybusyness mod_lbmethod_byrequests mod_lbmethod_bytraffic mod_lbmethod_heartbeat mod_proxy_ajp mod_proxy_balancer mod_proxy_connect mod_proxy_express mod_proxy_fcgi mod_proxy_fdpass mod_proxy_ftp mod_proxy_http mod_proxy_scgi mod_proxy_wstunnel mod_ssl mod_systemd mod_cgi mod_perl mod_php7
以上顯示 php7 安裝成功！
㈢ linux yum安裝php7.3
先安裝前面的教程，再安裝後面的
參考教程1：
https://blog.csdn.net/weixin_43731793/article/details/91488289
參考教程2：
http://www.bubuko.com/infodetail-2931909.html
安裝PHP
1、安裝PHP73
1.1、卸載舊版本PHP
yum remove php*
1.2、安裝EPEL：
sudo yum install epel-release
1.3、安裝remi（選一個）:
sudo rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-7.rpm
rpm -Uvh https://mirror.webtatic.com/yum/el7/webtatic-release.rpm
1.4、查看目前有php的什麼版本（可忽略）
sudo yum list php*
1.5、列出所有的php相關的rpm包（可忽略）
rpm -qa|grep php
1.6、刪除php相關的rpm包（一次只能刪除一個）（可忽略）
rpm -e php72w-mysqlnd-7.2.17-1.w7.x86_64
1.7、列出remi倉庫下所有PHP7.3可用模塊。（可忽略）
yum --enablerepo=remi-php73 search php | grep php73
1.8、安裝PHP 7.3
yum --enablerepo=remi-php73 install php
1、安裝 PHP7.3：
（解決yum安裝apache關聯不了PHP的問題，用以下命令安裝）
yum --enablerepo=remi-php73 install php
安裝模塊
yum --enablerepo=remi-php73 install php73-php-fpm php73-php-cli php73-php-bcmath php73-php-gd php73-php-json php73-php-mbstring php73-php-mcrypt php73-php-mysqlnd php73-php-opcache php73-php-pdo php73-php-pecl-crypto php73-php-pecl-mcrypt php73-php-pecl-geoip php73-php-recode php73-php-snmp php73-php-soap php73-php-xml
2、設置開機啟動、運行服務：
systemctl enable php73-php-fpm
systemctl start php73-php-fpm
3、查找php.ini位置：
find /etc/opt/remi/php73 -name php.ini
/etc/opt/remi/php73/php.ini
找到apache的配置文件：httpd.conf
sudo find / -name httpd.conf
位置如下：
/etc/httpd/conf/httpd.conf
5、PHP日常操作
systemctl restart php73-php-fpm #重啟
systemctl start php73-php-fpm #啟動
systemctl stop php73-php-fpm #關閉
systemctl status php73-php-fpm #檢查狀態
php -m #查看PHP已安裝拓展模塊
php -v #查看PHP版本
㈣ 在linux安裝PHP需要把原來的版本刪除嗎
用yum安裝的最好是刪掉比較好，自己編譯安裝的可以不用刪，但還是最好備份一下之前版本配置，還有版本切換的時候記得，擴展要同時更新。
㈤ linux centos 7 下用yum 安裝iso鏡像里自帶的php5.4.16版本的但是沒有php-fqm文件不知道怎麼重啟php服務
systemctl restart php-fpm.service #這條命令是重啟php服務
下面是一個比較靠譜的php安裝步驟：
先刪除已有的php版本 ，執行下面的命令刪除php
yum remove php-common
然後像安裝那樣問你是否繼續的，輸入yes即可
添加 yum 源
CentOS 6.x 的源
# rpm -Uvh http://download.Fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
# rpm -Uvh http://rpms.famillecollet.com/enterprise/remi-release-6.rpm
安裝 PHP
# yum install --enablerepo=remi,remi-php56 php php-opcache php-pecl-apcu php-devel php-mbstring php-mcrypt php-mysqlnd php-phpunit-PHPUnit php-pecl-xdebug php-pecl-xhprof php-pdo php-pear php-fpm php-cli php-xml php-bcmath php-process php-gd php-common
註：安裝5.6版本為remi-php56,安裝5.5版本為remi-php55