摘要：多個版本共存本例系統已通過安裝好了，所以后面手動安裝。但是為什么需要安裝多個版本的發揮你的小宇宙想象一下吧。

本例(ubuntu系統)已通過lnmp安裝好php7.1了，所以后面手動安裝php5.6.36。但是為什么需要安裝多個版本的PHP？發揮你的小宇宙想象一下吧。

下載php5.6.36

wget http://cn.php.net/distributions/php-5.6.36.tar.gz

解壓

tar zxvf ./php-5.6.36.tar.gz

配置

./configure 
--prefix=/usr/local/php56 
--with-config-file-path=/usr/local/php56/etc 
--with-config-file-scan-dir=/usr/local/php56/conf.d 
--enable-fpm 
--with-fpm-user=www 
--with-fpm-group=www 
--with-mysql=mysqlnd 
--with-mysqli=mysqlnd 
--with-pdo-mysql=mysqlnd 
--with-iconv-dir 
--with-freetype-dir=/usr/local/freetype 
--with-jpeg-dir 
--with-png-dir 
--with-zlib 
--with-libxml-dir=/usr 
--enable-xml 
--disable-rpath 
--enable-bcmath 
--enable-shmop 
--enable-sysvsem 
--enable-inline-optimization 
--with-curl 
--enable-mbregex 
--enable-mbstring 
--with-mcrypt 
--enable-ftp 
--with-gd 
--enable-gd-native-ttf 
--with-openssl 
--with-mhash 
--enable-pcntl 
--enable-sockets 
--with-xmlrpc 
--enable-zip 
--enable-soap 
--with-gettext 
--disable-fileinfo 
--enable-opcache 
--enable-intl 
--with-xsl

如果過程提示錯誤比如：freetype，就解決這些錯誤再重新執行配置

先搜索這個名字，看看安裝包的具體名字是什么，然后再使用apt-get安裝

apt-cache search freetype

apt-get install libfreetype6-dev

執行make

make

我出現了這種錯誤，recipe for target "sapi/cli/php" failed，解決方法是直接編輯makefile文件，搜索EXTRA_LIBS，在EXTRA_LIBS= 后面添加-liconv，如：EXTRA_LIBS = ..... -lcrypt -liconv，然后執行make clean，再執行一次make。
最后就是make install了

make install

cp /root/php-5.6.36/php.ini-development /usr/local/php56/etc/php.ini

打開并修改/usr/local/php56/etc/php.ini
查找 mysql.default_socket 改成

mysql.default_socket = /tmp/mysql.sock

查找 mysqli.default_socket 改成

mysqli.default_socket = /tmp/mysql.sock

查看php5.6版本

/usr/local/php56/bin/php -v

PHP 5.6.36 (cli) (built: May  1 2018 16:03:00) 
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies

因為 PHP 7 的服務文件為 php-fpm.service 所以這里用 php56-fpm.service

cp sapi/fpm/php-fpm.service /usr/lib/systemd/system/php56-fpm.service

編輯php56-fpm.service，修改

PIDFile=${prefix}/var/run/php-fpm.pid
ExecStart=${exec_prefix}/sbin/php-fpm --nodaemonize --fpm-config ${prefix}/etc/php-fpm.conf

為

PIDFile=/usr/local/php56/var/run/php-fpm.pid
ExecStart=/usr/local/php56/sbin/php-fpm --nodaemonize --fpm-config /usr/local/php56/etc/php-fpm.conf

在/usr/local/php56/etc下添加文件php-fpm.conf
內容為

[global]
pid = /usr/local/php56/var/run/php-fpm.pid
error_log = /usr/local/php56/var/log/php-fpm.log
log_level = notice

[www]
listen = /tmp/php56-cgi.sock
listen.backlog = -1
listen.allowed_clients = 127.0.0.1:9001
listen.owner = www
listen.group = www
listen.mode = 0666
user = www
group = www
pm = dynamic
pm.max_children = 20
pm.start_servers = 10
pm.min_spare_servers = 10
pm.max_spare_servers = 20
request_terminate_timeout = 100
request_slowlog_timeout = 0
slowlog = var/log/slow.log

在/usr/local/php56/var/run中添加一個文件php-fpm.pid，內容為

3353

因為php7的pid為3352，所以這里用3353，這個隨意，不要和別的軟件沖突就行。

重新載入 systemd

systemctl daemon-reload

可以設置開機啟動：

systemctl enable php56-fpm

立即啟動 php-fpm

systemctl start php56-fpm

查看php5.6的狀態

systemctl status php56-fpm

● php56-fpm.service - The PHP FastCGI Process Manager
   Loaded: loaded (/usr/lib/systemd/system/php56-fpm.service; enabled; vendor preset: enabled)
   Active: active (running) since Tue 2018-05-01 19:21:52 CST; 26s ago
 Main PID: 3353 (php-fpm)
   CGroup: /system.slice/php56-fpm.service
           ├─3353 php-fpm: master process (/usr/local/php56/etc/php-fpm.conf)                               
           ├─3373 php-fpm: pool www                                                                         
           ├─3374 php-fpm: pool www                                                                         
           ├─3375 php-fpm: pool www                                                                         
           ├─3376 php-fpm: pool www                                                                         
           ├─3377 php-fpm: pool www                                                                         
           ├─3378 php-fpm: pool www                                                                         
           ├─3379 php-fpm: pool www                                                                         
           ├─3380 php-fpm: pool www                                                                         
           ├─3381 php-fpm: pool www                                                                         
           └─3382 php-fpm: pool www                                                                         

May 01 19:21:52 iZ23mzd9hi4Z systemd[1]: Started The PHP FastCGI Process Manager.
May 01 19:22:05 iZ23mzd9hi4Z systemd[1]: Started The PHP FastCGI Process Manager.

查看php7的狀態

systemctl status php-fpm

● php-fpm.service - LSB: starts php-fpm
   Loaded: loaded (/etc/init.d/php-fpm; bad; vendor preset: enabled)
   Active: active (exited) since Tue 2018-05-01 14:47:03 CST; 4h 35min ago
     Docs: man:systemd-sysv-generator(8)

May 01 14:47:01 iZ23mzd9hi4Z systemd[1]: Starting LSB: starts php-fpm...
May 01 14:47:03 iZ23mzd9hi4Z php-fpm[771]: Starting php-fpm  done
May 01 14:47:03 iZ23mzd9hi4Z systemd[1]: Started LSB: starts php-fpm.

在/usr/local/nginx/conf下添加一個文件名為enable-php56.conf
內容為

location ~ [^/].php(/|$)
    {
        try_files $uri =404;
        fastcgi_pass  unix:/tmp/php56-cgi.sock;
        fastcgi_index index.php;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        include fastcgi_params;
    }

修改域名配置文件中的include enable-php.conf;為include enable-php56.conf;

server
    {
        listen 80;
        ...
        include enable-php56.conf;
        ...
    }

在各域名目錄下添加一個info.php文件測試一下