What could be causing the issue of not all data loading on the "Profile edit" page in PHP?

The issue of not all data loading on the "Profile edit" page in PHP could be caused by incomplete database queries or incorrect data retrieval methods. To solve this, ensure that all necessary data is being queried and fetched properly from the database before displaying it on the page.

// Make sure to query all necessary data for the profile edit page
$query = "SELECT * FROM users WHERE id = $user_id";
$result = mysqli_query($conn, $query);

if(mysqli_num_rows($result) > 0) {
    $row = mysqli_fetch_assoc($result);
    // Display the fetched data on the profile edit page
    echo "Username: " . $row['username'];
    echo "Email: " . $row['email'];
    // Add more fields as needed
} else {
    echo "Error: Data not found.";
}