Ubuntu系统下PHP7.3安装Imagick扩展失败，Laravel Intervention Image无法切换至Imagick驱动
我在Laravel项目里用Intervention Image库，想把驱动从GD换成Imagick，结果在Ubuntu服务器的PHP7.3环境下卡壳了，折腾了好几种方法都没解决，具体情况如下：
问题现象
执行php -ini查看配置时，显示的配置路径是/etc/php/7.3/cli，同时弹出PHP启动警告：
PHP Warning: PHP Startup: Unable to load dynamic library '/usr/lib/php/20170718/imagick.so' (tried: /usr/lib/php/20170718/imagick.so (/usr/lib/php/20170718/imagick.so: undefined symbol: _zval_ptr_dtor), /usr/lib/php/20180731//usr/lib/php/20170718/imagick.so.so (/usr/lib/php/20180731//usr/lib/php/20170718/imagick.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
尝试过的操作
- 最初的安装尝试
我用命令sudo apt-get install php-imagick安装Imagick扩展，但从安装日志能看出来，装的是适配PHP7.2的版本，根本不是我用的PHP7.3：
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
php-imagick
0 upgraded, 1 newly installed, 0 to remove and 4 not upgraded.
Need to get 0 B/90.7 kB of archives.
After this operation, 477 kB of additional disk space will be used.
Selecting previously unselected package php-imagick.
(Reading database ... 103072 files and directories currently installed.)
Preparing to unpack .../php-imagick_3.4.3~rc2-2ubuntu4.1_amd64.deb ...
Unpacking php-imagick (3.4.3~rc2-2ubuntu4.1) ...
Setting up php-imagick (3.4.3~rc2-2ubuntu4.1) ...
Processing triggers for php7.2-phpdbg (7.2.24-0ubuntu0.18.04.17) ...
Processing triggers for php7.2-cli (7.2.24-0ubuntu0.18.04.17) ...
- 修改PHP配置文件
我编辑了PHP7.3的CLI配置文件（命令：sudo nano /etc/php/7.3/cli/php.ini），分别试了两种配置方式，都没让PHP识别到Imagick模块：
extension=imagick.soextension=/usr/lib/php/20170718/imagick.so
尝试安装对应版本的扩展
我想直接装PHP7.3专属的Imagick扩展，执行sudo apt-get install php7.3-imagick，结果系统提示“Unable to locate package php7.3-imagick”。查找扩展文件位置
用sudo find /usr -name imagick.so查找Imagick的安装路径，得到的结果是：/usr/lib/php/20170718/imagick.so
备注：内容来源于stack exchange，提问作者gabogabans
