How can the user modify their PHP code to properly display and update the data in the MySQL database as intended?

The user can modify their PHP code by ensuring that they properly connect to the MySQL database, execute the SQL query to update the data, and handle any errors that may occur during the process. They should also sanitize user input to prevent SQL injection attacks. 

<?php
// Connect to MySQL database
$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);
}

// Sanitize user input
$id = $_POST['id'];
$name = mysqli_real_escape_string($conn, $_POST['name']);
$age = mysqli_real_escape_string($conn, $_POST['age']);

// Update data in MySQL database
$sql = "UPDATE users SET name='$name', age='$age' WHERE id=$id";

if ($conn->query($sql) === TRUE) {
    echo "Record updated successfully";
} else {
    echo "Error updating record: " . $conn->error;
}

$conn->close();
?>

Keywords

PHP MySQL database update display

Related Questions