How can PHP be used to retrieve and display specific data from a database based on user interactions?

To retrieve and display specific data from a database based on user interactions, you can use PHP in combination with SQL queries. You can pass user input (such as form submissions or URL parameters) to your PHP script, which then constructs and executes a SQL query to fetch the relevant data from the database. Finally, you can display the retrieved data on the webpage using PHP. 

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

// Retrieve user input (e.g., from a form submission or URL parameter)
$user_id = $_GET['user_id'];

// Construct and execute a SQL query to fetch specific data based on user input
$sql = "SELECT * FROM users WHERE id = $user_id";
$result = mysqli_query($connection, $sql);

// Display the retrieved data on the webpage
if (mysqli_num_rows($result) > 0) {
    while ($row = mysqli_fetch_assoc($result)) {
        echo "User ID: " . $row['id'] . "<br>";
        echo "Username: " . $row['username'] . "<br>";
        // Display other relevant data fields
    }
} else {
    echo "No data found for the specified user ID.";
}

// Remember to close the database connection
mysqli_close($connection);
?>

Keywords

PHP database retrieval user interactions display

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