How can PHP developers effectively communicate with external scripts to retrieve and display user data from a database within a PHP framework like PHPKit?

To effectively communicate with external scripts to retrieve and display user data from a database within a PHP framework like PHPKit, PHP developers can use PHP's built-in functions like mysqli or PDO to establish a connection to the database, execute queries to retrieve the necessary data, and then display it on the webpage using HTML and PHP.

<?php
// Connect to the database using mysqli
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// Retrieve user data from the database
$sql = "SELECT * FROM users";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // Output data of each row
    while($row = $result->fetch_assoc()) {
        echo "Name: " . $row["name"]. " - Email: " . $row["email"]. "<br>";
    }
} else {
    echo "0 results";
}

$conn->close();
?>