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如果你在Linux虚拟机VirtualBox里运行FreeBSD 12系统，可以安装PHP 7.2，请按以下步骤操作。安装虚拟机请参考在Ubuntu 18.04/Debian 9上安装VirtualBox 6.0的方法一文。对于PHP 7.3，请参考给在Linux虚拟机里运行的FreeBSD 12安装PHP 7.3一文。
步骤一、更新ports tree
首先使用portsnap命令更新FreeBSD系统的ports tree：
$ jmutai@freebsd:~ % su -
Password:
root@freebsd:~# portsnap fetch update
Looking up portsnap.FreeBSD.org mirrors... 5 mirrors found.
Fetching public key from ec2-ap-southeast-2.portsnap.freebsd.org... done.
Fetching snapshot tag from ec2-ap-southeast-2.portsnap.freebsd.org... done.
Fetching snapshot metadata... done.
Fetching snapshot generated at Wed Mar 06 01:19:28 UTC 2019:
Extracting snapshot... done.
Verifying snapshot integrity... done.
Fetching snapshot tag from ec2-ap-southeast-2.portsnap.freebsd.org... done.
Fetching snapshot metadata... done.
Updating from Wed Mar 06 01:19:28 UTC 2019 to Wed Mar 06 09:15:19 UTC 2019.
Fetching 5 metadata patches... done.
Applying metadata patches... done.
Fetching 0 metadata files... done.
Fetching 78 patches.
(78/78) 100.00% done.
done.
Applying patches...
done.
Fetching 3 new ports or files... done.
/usr/ports was not created by portsnap.
You must run 'portsnap extract' before running 'portsnap update'.
首次运行Portsnap时，需要将快照解压缩到/usr/ports：
# portsnap extract
应该能返回如下行：
Building new INDEX files... done.
然后运行portsnap fetch update命令确认：
# portsnap fetch update
Looking up portsnap.FreeBSD.org mirrors... 5 mirrors found.
Fetching snapshot tag from ec2-eu-west-1.portsnap.freebsd.org... done.
Latest snapshot on server matches what we already have.
No updates needed.
Ports tree is already up to date.
默认情况下，Ports Collection本身存储为/usr/ports的子目录。
步骤二、在FreeBSD上安装PHP 7.2
有两种方法可以在FreeBSD上安装PHP 7.2：
1、从二进制包安装。
2、使用端口从源安装。
方法1：从二进制文件在FreeBSD上安装PHP 7.2
如果尚未下载并安装pkg：
# /usr/sbin/pkg
The package management tool is not yet installed on your system.
Do you want to fetch and install it now? [y/N]: y
Bootstrapping pkg from pkg+http://pkg.FreeBSD.org/FreeBSD:13:amd64/latest, please wait...
Verifying signature with trusted certificate pkg.freebsd.org.2013102301... done
Installing pkg-1.10.5_5...
the most recent version of pkg-1.10.5_5 is installed
然后安装PHP 7.2：
# pkg install php72
Updating FreeBSD repository catalogue...
FreeBSD repository is up to date.
All repositories are up to date.
The following 3 package(s) will be affected (of 0 checked):
New packages to be INSTALLED:
php72: 7.2.10
libargon2: 20171227_1
pcre: 8.42
Number of packages to be installed: 3
The process will require 31 MiB more space.
5 MiB to be downloaded.
Proceed with this action? [y/N]: y
[1/3] Fetching php72-7.2.10.txz: 100% 3 MiB 192.9kB/s 00:18
[2/3] Fetching libargon2-20171227_1.txz: 100% 64 KiB 65.3kB/s 00:01
[3/3] Fetching pcre-8.42.txz: 100% 1 MiB 44.9kB/s 00:28
Checking integrity... done (0 conflicting)
[1/3] Installing libargon2-20171227_1...
[1/3] Extracting libargon2-20171227_1: 100%
[2/3] Installing pcre-8.42...
[2/3] Extracting pcre-8.42: 100%
[3/3] Installing php72-7.2.10...
[3/3] Extracting php72-7.2.10: 100%
确认已安装的PHP版本：
# php -v
PHP 7.2.10 (cli) (built: Dec 1 2018 01:31:03) ( NTS )
Copyright (c) 1997-2018 The PHP Group
Zend Engine v3.2.0, Copyright (c) 1998-2018 Zend Technologies
同时可以在FreeBSD上安装PHP 7.2扩展。
使用syntaxphp72-安装扩展：
# pkg install php72-curl php72-extensions php72-json php72-xml \
php72-zip php72-intl php72-mysqli php72-pdo_mysql php72-pdo \
php72-pear php72-soap php72-phar
使用以下命令查看已加载：
# php -m
方法2：从端口在FreeBSD上安装PHP 7.2
将你的工作目录更改为PHP 7.2 ports文件夹：
# cd /usr/ports/lang/php72
然后构建并安装PHP 7.2：
# make install clean
要在FreeBSD上安装PHP 7.2扩展，请执行以下操作：
# cd /usr/ports/lang/php72-extensions/
# make install clean
至此，你现在已在FreeBSD上安装了PHP 7.2。
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