水平太差 特来求助 [docker-compose LNMP 数据库连不上]

做个临时站点 从未学过 docker 听说很方便 于是看了几篇网上教程 复制粘贴后稍作修改 目前情况是：docker-compose 能运行， 各容器能运行，网站能打开 phpinfo，phpmyadmin 能连接上 mariadb 。但是安装 wordpress 时，已经用 phpmyadmin 建了数据库和用户授权。但安装页面填好数据库用户名等信息提交后，提示“There has been a critical error on this website.” 哪位能指点下 可能是哪里出问题了？下面是配置文件 不知道有没有写错的地方？

[目录结构]

|—— html
	|—— index.php
|—— mariadb
	|—— conf.d  
	|—— db
	|—— logs
|—— nginx
	|—— conf.d  
		|—— domain
			|fullchain.cer & domain.key
		|—— default.conf
	|—— logs  
	|—— nginx.conf
|—— php
	|—— logs
	|—— Dockerfile
|—— docker-compose.yml

[ Dockerfile ]

FROM php:7.4-fpm-alpine
Run apt install iputils-ping \
&& docker-php-ext-install mysqli && docker-php-ext-enable mysqli && docker-php-ext-install pdo pdo_mysql

[ docker-compose.yml ]

version: '3'
networks:
    lnmp-net:
        driver: bridge
services:
    mariadb:
        container_name: mariadb
        image: mariadb:10.4
        ports:
            - 3306:3306
        environment:
            MYSQL_ROOT_PASSWORD: xxxxxx
        volumes:
            - /lnmp/mariadb/db:/var/lib/mysql
            - /lnmp/mariadb/conf.d:/etc/my.cnf.d
            - /lnmp/mariadb/logs:/var/log/mariadb
        restart: always
        networks:
            - lnmp-net
    nginx:
        container_name: nginx
        image: nginx:latest
        ports:
            - 80:80
            - 443:443
        volumes:
            - /lnmp/html:/usr/share/nginx/html
            - /lnmp/nginx/nginx.conf:/etc/nginx/nginx.conf
            - /lnmp/nginx/conf.d:/etc/nginx/conf.d
            - /lnmp/nginx/logs:/var/log/nginx         
        depends_on:
            - mariadb
            - php
        restart: always
        networks:
            - lnmp-net
    php:
        container_name: php
        build: ./php
        image: php:7.4-fpm-alpine
        ports:
            - 9000:9000
        volumes:
            - /lnmp/html:/var/www/html
            - /lnmp/php/php.ini:/usr/local/etc/php/php.ini
            - /lnmp/php/logs:/usr/local/var/log
        restart: always
        networks:
            - lnmp-net
    phpmyadmin:
        container_name: phpmyadmin
        image: phpmyadmin/phpmyadmin
        ports:
            - 2000:80
        restart: always
        environment:
            PMA_HOST: mariadb
        networks:
            - lnmp-net

[/lnmp/nginx/conf.d/default.conf ]

......
    root /usr/share/nginx/html; 
    index index.html index.htm index.php;
	error_page   500 502 503 504  /50x.html;
    location = /50x.html {
		root /usr/share/nginx/html;
    } 
    location ~ \.php$ {
        fastcgi_pass   php:9000;
        fastcgi_index  index.php;
        fastcgi_param  SCRIPT_FILENAME  /var/www/html/$fastcgi_script_name;
        include        fastcgi_params;
    }
    location ~ /\.ht {
        deny all;
    }
}