How can PHP be used to integrate functionality for marking and linking specific data from a database when typing in a text field?

To integrate functionality for marking and linking specific data from a database when typing in a text field, you can use AJAX to send requests to the server to fetch relevant data based on the user input. The server-side PHP code can query the database for matching data and return it to the client-side JavaScript for display. The JavaScript can then dynamically update the text field with the linked data as the user continues typing.

<?php
// Assuming you have a database connection established

if(isset($_GET['search_query'])) {
    $search_query = $_GET['search_query'];

    // Perform a database query to search for matching data
    $query = "SELECT * FROM your_table WHERE column_name LIKE '%$search_query%'";
    $result = mysqli_query($connection, $query);

    // Return the results as JSON
    $data = [];
    while($row = mysqli_fetch_assoc($result)) {
        $data[] = $row['column_name'];
    }
    echo json_encode($data);
}
?>