首先安装编译PHP所需的依赖包：

sudo apt update
apt install build-essential autoconf automake libtool libsqlite3-dev pkg-config libjpeg-dev libpng-dev libxml2-dev libbz2-dev libcurl4-openssl-dev libssl-dev libffi-dev libwebp-dev libonig-dev libzip-dev imagemagick libmagickwand-dev git vim -y

下载PHP 8.1源码

cd /tmp
wget https://www.php.net/distributions/php-8.1.32.tar.gz
tar -zxf php-8.1.32.tar.gz
cd php-8.1.32

配置编译选项（包含所需扩展）

./configure --prefix=/usr/local/php8.1 \
    --with-config-file-path=/usr/local/php8.1/etc \
    --with-mysqli \
    --with-pdo-mysql \
    --enable-fpm \
    --with-bz2 \
    --with-fpm-user=www-data \
    --with-fpm-group=www-data \
    --enable-fileinfo \
    --enable-exif \
    --enable-pcntl \
    --enable-mbstring \
    --with-curl \
    --with-openssl \
    --enable-sockets \
    --enable-gd \
    --with-jpeg \
    --with-zlib \
    --with-webp \
    --with-zip \
    --with-freetype \
    --enable-opcache

编译并安装

make -j$(nproc)
sudo make install

创建配置文件

sudo mkdir -p /usr/local/php8.1/etc
sudo cp php.ini-production /usr/local/php8.1/etc/php.ini

cd /usr/local/php8.1/etc
cp php-fpm.conf.default php-fpm.conf
cp php-fpm.d/www.conf.default php-fpm.d/www.conf

添加到环境变量

echo 'export PATH=/usr/local/php8.1/bin:/usr/local/php8.1/sbin:$PATH' | sudo tee -a /etc/profile
source /etc/profile

下载Imagick源码

cd /tmp
git clone https://github.com/Imagick/imagick.git
cd imagick
phpize
./configure --with-php-config=/usr/local/php8.1/bin/php-config
make
sudo make install

配置PHP启用扩展

编辑PHP配置文件添加扩展：

sudo vi /usr/local/php8.1/etc/php.ini

找到extension=部分，添加以下行：

extension=imagick

将php-fpm添加到系统服务管理

vi /lib/systemd/system/php-fpm.service

[Unit]
Description=The PHP FastCGI Process Manager
After=network.target

[Service]
Type=simple
PIDFile=/usr/local/php8.1/var/run/php-fpm.pid
ExecStart=/usr/local/php8.1/sbin/php-fpm --nodaemonize --fpm-config /usr/local/php8.1/etc/php-fpm.conf
ExecReload=/bin/kill -USR2 $MAINPID

[Install]
WantedBy=multi-user.target