How can I resolve MySQL connection issues for my delivery company website?

It sounds like your hosting provider, Hostinger, could be blocking your external connections for security reasons. Many hosting services require you to whitelist your IP or adjust certain settings to allow access. I suggest checking out their documentation on setting this up. It could save you a lot of hassle!

You might want to double-check if your MySQL server is accepting remote connections. Make sure to look at the bind-address in your MySQL configuration; it should be set to 0.0.0.0 instead of 127.0.0.1. Also, after making any changes, don't forget to restart MySQL.

If that doesn't work, check if your user has permission to connect from your host. Remember, MySQL users are host-specific, so ensure you're using the right settings.

Another thing to verify is your connection string format. It should look like this: mysql://user:password@host:3306/database. If SSL is required, make sure you add ?ssl=true to the connection string.

Lastly, if you can access the database locally via phpMyAdmin, that's a good sign, but you might need to check your firewall settings as well. Sometimes, port 3306 can get blocked.