Why can't php connect to the database?

Solution to the problem that PHP cannot connect to the database

Solution process:

1 , First open the browser console to see if it is a browser problem.

2. Check the apache error log

Found the problem in /var/log/apache2/error.log.1:

Uncaught Error: Class 'mysqli' not found

3. Locking problem

The database extension is not enabled in the php.ini file.

3.1. Open /ect/php/7.2/apache2/php.ini

3.2. Find ;extension=mysqli and remove the previous comment

4 , Restart the apache server

After restarting the server, re-run the program.

Recommended tutorial: PHP video tutorial

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