Discuss the process of connecting PHP applications to databases and performing basic database operations.

Connecting PHP applications to databases and performing basic database operations involve several steps. Here's an in-depth discussion of the process: 1. Database Connectivity: * To connect a PHP application to a database, you need to establish a connection using appropriate credentials. * PHP provides various extensions for connecting to different types of databases, such as MySQL, PostgreSQL, SQLite, etc. * The most common extension is MySQLi (MySQL Improved), which supports MySQL databases. Another popular option is PDO (PHP Data Objects), which provides a consistent interface for working with multiple databases. * Example (MySQLi): ``` php`$host = "localhost"; $username = "root"; $password = "password"; $database = "my\_database"; $connection = new mysqli($host, $username, $password, $database); if ($connection->connect_error) { die("Connection failed: " . $connection->connect_error); }` ``` * In the above example, the `mysqli` class is used to create a new database connection. If the connection fails,....