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当我试图从 PHP 7.2.X 版本加载 mcrypt 扩展模块时。
因此，我尝试使用与我的 PHP 的当前版本兼容的 PECL 库，以便安装并点击此链接： Installing mcrypt on PHP 7.2 during installation！
以下是在终端上执行某些命令后获得的结果。
root@YYY:/var/www/html/orocrm# apt install php-pear
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
libllvm4.0
Use 'sudo apt autoremove' to remove it.
The following NEW packages will be installed:
php-pear
0 upgraded, 1 newly installed, 0 to remove and 14 not upgraded.
Need to get 285 kB of archives.
After this operation, 2,107 kB of additional disk space will be used.
Get:1 http://ppa.launchpad.net/ondrej/php/ubuntu xenial/main amd64 php-pear all 1:1.10.5+submodules+notgz-1+ubuntu16.04.1+deb.sury.org+1 [285 kB]
Fetched 285 kB in 1s (230 kB/s)
Selecting previously unselected package php-pear.
(Reading database ... 215503 files and directories currently installed.)
Preparing to unpack .../php-pear_1%3a1.10.5+submodules+notgz-1+ubuntu16.04.1+deb.sury.org+1_all.deb ...
Unpacking php-pear (1:1.10.5+submodules+notgz-1+ubuntu16.04.1+deb.sury.org+1) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up php-pear (1:1.10.5+submodules+notgz-1+ubuntu16.04.1+deb.sury.org+1) ...
YYY@YYY:/var/www/html/orocrm$ sudo apt-get -y install gcc make autoconf libc-dev pkg-config
[sudo] password for YYY:
Reading package lists... Done
Building dependency tree
Reading state information... Done
Note, selecting 'libc6-dev' instead of 'libc-dev'
gcc is already the newest version (4:5.3.1-1ubuntu1).
make is already the newest version (4.1-6).
pkg-config is already the newest version (0.29.1-0ubuntu1).
libc6-dev is already the newest version (2.23-0ubuntu9).
The following package was automatically installed and is no longer required:
libllvm4.0
Use 'sudo apt autoremove' to remove it.
Suggested packages:
autoconf-archive gnu-standards autoconf-doc libtool
The following NEW packages will be installed:
autoconf automake autotools-dev libsigsegv2 m4
0 upgraded, 5 newly installed, 0 to remove and 14 not upgraded.
Need to get 1,079 kB of archives.
After this operation, 3,998 kB of additional disk space will be used.
Get:1 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 libsigsegv2 amd64 2.10-4 [14.1 kB]
Get:2 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 m4 amd64 1.4.17-5 [195 kB]
Get:3 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 autoconf all 2.69-9 [321 kB]
Get:4 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 autotools-dev all 20150820.1 [39.8 kB]
Get:5 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 automake all 1:1.15-4ubuntu1 [510 kB]
Fetched 1,079 kB in 2s (447 kB/s)
Selecting previously unselected package libsigsegv2:amd64.
(Reading database ... 215198 files and directories currently installed.)
Preparing to unpack .../libsigsegv2_2.10-4_amd64.deb ...
Unpacking libsigsegv2:amd64 (2.10-4) ...
Selecting previously unselected package m4.
Preparing to unpack .../archives/m4_1.4.17-5_amd64.deb ...
Unpacking m4 (1.4.17-5) ...
Selecting previously unselected package autoconf.
Preparing to unpack .../autoconf_2.69-9_all.deb ...
Unpacking autoconf (2.69-9) ...
Selecting previously unselected package autotools-dev.
Preparing to unpack .../autotools-dev_20150820.1_all.deb ...
Unpacking autotools-dev (20150820.1) ...
Selecting previously unselected package automake.
Preparing to unpack .../automake_1%3a1.15-4ubuntu1_all.deb ...
Unpacking automake (1:1.15-4ubuntu1) ...
Processing triggers for install-info (6.1.0.dfsg.1-5) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for doc-base (0.10.7) ...
Processing 1 added doc-base file...
Setting up libsigsegv2:amd64 (2.10-4) ...
Setting up m4 (1.4.17-5) ...
Setting up autoconf (2.69-9) ...
Setting up autotools-dev (20150820.1) ...
Setting up automake (1:1.15-4ubuntu1) ...
update-alternatives: using /usr/bin/automake-1.15 to provide /usr/bin/automake (automake) in auto mode
Processing triggers for libc-bin (2.23-0ubuntu9) ...
YYY@YYY:/var/www/html/orocrm$ sudo apt-get -y install libmcrypt-dev
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
libllvm4.0
Use 'sudo apt autoremove' to remove it.
The following NEW packages will be installed:
libmcrypt-dev
0 upgraded, 1 newly installed, 0 to remove and 14 not upgraded.
Need to get 83.7 kB of archives.
After this operation, 438 kB of additional disk space will be used.
Get:1 http://in.archive.ubuntu.com/ubuntu xenial/universe amd64 libmcrypt-dev amd64 2.5.8-3.3 [83.7 kB]
Fetched 83.7 kB in 0s (105 kB/s)
Selecting previously unselected package libmcrypt-dev.
(Reading database ... 215484 files and directories currently installed.)
Preparing to unpack .../libmcrypt-dev_2.5.8-3.3_amd64.deb ...
Unpacking libmcrypt-dev (2.5.8-3.3) ...
Processing triggers for man-db (2.7.5-1) ...
Setting up libmcrypt-dev (2.5.8-3.3) ...
YYY@YYY:/var/www/html/orocrm$ sudo pecl7.2-sp install --nodeps mcrypt-snapshot
sudo: pecl7.2-sp: command not found
当我收到这种类型的错误时 pecl7.2-sp: command not found
在文档部分，已经明确声明它已被弃用，并且从安全角度来看将不再可用 - 从那时起，从 PHP 7.2.X 的发布版本开始。
但是一些项目需要这些依赖项，以便在必要时执行所需的功能。我需要如何解决上述问题？
更新：
TL;博士：
我从投票中得到了很多回应发布的答案。需要根据操作系统架构级别对答案进行分类。由于我使用共享服务器进行托管，因此有多个项目驻留在它上面并且使用 PHP 5.XX 的版本进行编码，所以我决定降级到默认支持 mcrypt 扩展的 PHP 7.1.X我基于 Debian 的操作系统。
正如我在 Server Pilot 社区 在 PHP 7.2 上安装 mcrypt 扩展时 的链接中已经提到的那样。这些人告诉过更新版本的 pecl-7.2 可用于在 PHP-7.2 上安装 mcrypt。不幸的是，它以 pecl7.2-sp: command not found 结束，来自已执行的命令。后来网站页面得到了更新，所以那里的命令与执行时尝试的命令不匹配。
最后，无论哪种解决方案都适合您的操作系统架构级别，就去做吧！
或者
如果以下方法不能解决根本原因。
或者，您可以选择默认支持 mcrypt 扩展的 PHP 7.1.X 版本
原文由 Nɪsʜᴀɴᴛʜ ॐ 发布，翻译遵循 CC BY-SA 4.0 许可协议
ubuntu
最后，运行以下命令打开 PHP 配置文件
sudo nano /etc/php/7.2/cli/php.ini 然后将下面的行添加到文件中，就在[PHP]下面并保存…
对于 Apache2
对于 Nginx
你可以重启php