How can a timer be implemented in PHP to retrieve values from a SQL database and display them on a webpage?

To implement a timer in PHP to retrieve values from a SQL database and display them on a webpage, you can use the `setInterval` JavaScript function to periodically make an AJAX request to a PHP script that fetches data from the database. The PHP script should query the database and return the results in a JSON format. On the frontend, you can then update the webpage with the retrieved data. 

<?php
// PHP script to fetch data from SQL database
// Connect to database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database";

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

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

// Fetch data from database
$sql = "SELECT * FROM table";
$result = $conn->query($sql);

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

$conn->close();
?>

Keywords

PHP Timer SQL database Webpage Retrieval

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