How MySQL Collation & Charset Settings Impact Performance
michael Worth to learn https://www.percona.com/blog/charset-and-collation-settings-impact-on-mysql-performance
changing field char set to store Emoji Character in MySQL
https://stackoverflow.com/questions/39463134/how-to-store-emoji-character-in-mysql-database php $this->pdo = new PDO(“mysql:host=$ip;port=$port;dbname=$db;charset=utf8mb4”
Avoid single quote in MySQL fields
use ‘’’ instead of ” code: