Are there any specific best practices or guidelines for handling database queries in PHP to avoid errors like "Call to undefined function"?

When encountering the error "Call to undefined function" in PHP database queries, it typically means that the function being called is not properly included or defined. To avoid this error, always ensure that the necessary database connection and query functions are included or defined before using them in your code.

// Include the database connection file that defines the necessary functions
include 'db_connection.php';

// Call the database query function after ensuring it is included
$result = get_data_from_database();