docker-compose simple example with nginx php and mysql - docker-compose

Question

Can someone help me to connect my PHP and MySQL
I did manage to make it up and running, connect to DB with MySQL Workbench but when I try PDO connect from PHP file it fails for some reason...
docker-compose
web:
image: nginx:latest
ports:
- "80:80"
volumes:
- ./:/var/www
- ./site.conf:/etc/nginx/conf.d/site.conf
links:
- php
php:
image: php:7-fpm
volumes:
- ./:/var/www
links:
- db
db:
image: mysql:5.7
volumes:
- /var/lib/mysql
environment:
- MYSQL_ROOT_PASSWORD=123456
- MYSQL_DATABASE=database
ports:
- "3306:3306"
site.conf
server {
index index.php index.html;
server_name lara.test;
error_log /var/log/nginx/error.log;
access_log /var/log/nginx/access.log;
root /var/www;
location ~ \.php$ {
try_files $uri =404;
fastcgi_split_path_info ^(.+\.php)(/.+)$;
fastcgi_pass php:9000;
fastcgi_index index.php;
include fastcgi_params;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
fastcgi_param PATH_INFO $fastcgi_path_info;
}
}
and index.php
<?php
$database = new PDO('mysql:host=localhost;dbname=database', "root", "123456");
echo "Connected to MySQL<br />";
?>
and error message:
Fatal error: Uncaught PDOException: could not find driver in
/var/www/index.php:3 Stack trace: #0 /var/www/index.php(3):
PDO->__construct('mysql:host=loca...', 'root', '123456') #1 {main}
thrown in /var/www/index.php on line 3
what do I miss in order to make this work?

Answer 1

Just change
$database = new PDO('mysql:host=localhost;dbname=database', "root",
"123456");
to
$database = new PDO('mysql:host=db;dbname=database', "root", "123456");
the name of host must same with the name of database image on docker-compose file.