1. Edit file /etc/my.cnf.d/mariadb-server.cnf and add these 3 lines to the [mysqld] section:

innodb_large_prefix=true
innodb_file_format=barracuda
innodb_file_per_table=true

This will enable usage of Multi-byte (in particular – 4-byte) UTF-8 support in Drupal 7.

2. mysqli: If you have problems with mysqli/mysql change the mysqli to mysql (or vice versa – whatever […]