How can PHP be used to create a form that interacts with a database to display and update data?

To create a form that interacts with a database to display and update data using PHP, you would need to establish a connection to the database, retrieve the data to display in the form fields, and then update the database with the new data submitted through the form. 

<?php
// Establish a connection to the database
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

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

// Retrieve data from the database to display in the form fields
$sql = "SELECT * FROM table_name WHERE id = 1";
$result = $conn->query($sql);
$row = $result->fetch_assoc();

// Update the database with new data submitted through the form
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $newData = $_POST['new_data'];

    $updateSql = "UPDATE table_name SET column_name = '$newData' WHERE id = 1";
    $conn->query($updateSql);
}
?>

<form method="post">
    <input type="text" name="new_data" value="<?php echo $row['column_name']; ?>">
    <input type="submit" value="Update">
</form>

Keywords

PHP form database interaction data display data update

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