• 上传大小限制：

http{
    client_max_body_size 1024m;
}

若上传文件的大小超过这个值，会报错：client intended to send too large body — Wu Xiaokiang 2021/02/03 10:43

• 虚拟目录PHP配置

example.conf

server {
        listen 80;
 
        root /srv/www/www.example.com;
        index index.php index.html index.htm;
        server_name www.example.com;
 
        location / {
                try_files $uri $uri/ =404;
        }
        # 定义虚拟目录，最下层路径名不相同的话只能用alias，不能用root。 实际路径为alias指定路径。用root时，实际路径
        # 为root  +  location。
        location /postfixadmin/ {
                alias  /usr/share/postfixadmin/public/;
                index index.html index.php;
        }
 
        #这一段必须放到location ~ \.php$之前，否则不生效。
        location ~^/postfixadmin/.+\.php$ {
                if ($fastcgi_script_name ~ /postfixadmin/(.+\.php.*)$) {
                        set $valid_fastcgi_script_name $1;
                }
                fastcgi_param  SCRIPT_FILENAME  /usr/share/postfixadmin/public/$valid_fastcgi_script_name;
 
                # 若用默认的fastcgi.conf  SCRIPT_FILENAME会变成$document_root$fastcgi_script_name，
                # 会去/srv/www/www.example.com/postfixadmin/下寻找PHP文件，结果会是404。
                # 虚拟目录配PHP支持，关键就是这个变量。
 
                fastcgi_split_path_info ^(.+?\.php)(/.*)$;
                try_files $fastcgi_script_name =404;
                set $path_info $fastcgi_path_info;
                fastcgi_param PATH_INFO $path_info;
                fastcgi_index index.php;
                include fastcgi_params;
                fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        }
 
        # pass PHP scripts to FastCGI server
        #
        location ~ \.php$ {
                include snippets/fastcgi-php.conf;
 
                # With php-fpm (or other unix sockets):
                fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
                # With php-cgi (or other tcp sockets):
                #fastcgi_pass 127.0.0.1:9000;
        }
        # pass PHP scripts to FastCGI server
        #
        location ~ \.php$ {
                include fastcgi-php.conf;
                fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
        }
 
        access_log  /srv/logs/example.log;
        error_log  /srv/logs/example.error.log;
}