PHP错误出现在PHP和Nginx容器中

最近,我一直在尝试从PHP应用程序中本地基于文件的日志记录转移到通过stdout推送PHP错误,以便在docker设置中与其他日志一起输出,并遵循既定原则 here 。如果您设置 error_log 位置到 /dev/stdout 然后我通过跟踪docker日志看到了来自PHP的错误。然而,nginx容器中也会出现同样的错误,如下所示,通过“stderr中发送的FastCGI”:

docker-compose-nginx-phpfpm-php-fpm-1  | NOTICE: PHP message: test
docker-compose-nginx-phpfpm-php-fpm-1  | 172.18.0.3 -  18/Jan/2022:20:00:20 +0000 "GET /index.php" 200
docker-compose-nginx-phpfpm-web-1      | 2022/01/18 20:00:20 [error] 32#32: *18 FastCGI sent in stderr: "PHP message: test" while reading response header from upstream, client: 172.18.0.1, server: phpfpm.local, request: "GET / HTTP/1.1", upstream: "fastcgi://172.18.0.2:9000", host: "localhost:8080"

为了清晰起见:

PHP容器日志

docker-compose-nginx-phpfpm-php-fpm-1  | NOTICE: PHP message: test

Nginx容器日志

docker-compose-nginx-phpfpm-web-1      | 2022/01/18 20:00:20 [error] 32#32: *18 FastCGI sent in stderr: "PHP message: test" while reading response header from upstream, client: 172.18.0.1, server: phpfpm.local, request: "GET / HTTP/1.1", upstream: "fastcgi://172.18.0.2:9000", host: "localhost:8080"

这是怎么回事?这是意料之中的行为吗?

这是一个非常基本和标准的php fpm/nginx设置的结果,它有一个像这样的docker-compose.yml:

version: "3.9"

services:
    web:
        image: nginx:latest
        ports:
            - "8080:80"
        volumes:
            - ./src:/var/www/html
            - ./default.conf:/etc/nginx/conf.d/default.conf
        links:
            - php-fpm
    php-fpm:
        image: php:8-fpm
        volumes:
            - ./src:/var/www/html

类似default.conf的:

server {
    index index.php index.html;
    server_name phpfpm.local;
    error_log  /var/log/nginx/error.log;
    access_log /var/log/nginx/access.log;
    root /var/www/html;

    location ~ \.php$ {
        try_files $uri =404;
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass php-fpm:9000;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_param PATH_INFO $fastcgi_path_info;
    }
}

和类似index.php的:

<?php
ini_set('display_errors', 'off');
ini_set('error_log', '/dev/stdout');
error_log('test');
echo phpinfo();