Trying to create update profile page in PHP PDO - php

Question

I am trying to create an update profile page in PHP. But, I keep running into an error. When I submit the form to update the profile, there are four fields. Username, email, firstname, and lastname. Say I want to change only the first name of the user, when I submit the form, it gives me an error telling me the username/email/lastname is taken because that was already auto-filled in.
Here is my update profile form, the fields contain user information pulled from the database
Here is my update profile code that goes along with the form
// Queries
if (isset($_POST['userprofileupdate'])) {
$firstname = mysqli_real_escape_string($conn, $_POST['name_1']);
$lastname = mysqli_real_escape_string($conn, $_POST['name_2']);
$email = mysqli_real_escape_string($conn, $_POST['email_1']);
$username = mysqli_real_escape_string($conn, $_POST['username']);
// Check if Email exists
$stmt = $pdo->prepare('SELECT * FROM `users` WHERE `email` = :email ');
$stmt->bindParam(":email", $email, PDO::PARAM_STR);
$stmt->execute();
$Count = $stmt->rowCount();
// Check if username exists
$stmt = $pdo->prepare('SELECT * FROM `users` WHERE `username` = :username ');
$stmt->bindParam(":username", $username, PDO::PARAM_STR);
$stmt->execute();
$Count1 = $stmt->rowCount();
if ($Count < 1) {
if ($Count1 < 1) {
$query = "UPDATE users SET username=?, firstname=?, lastname=?, email=? WHERE id=?";
$stmt = $pdo->prepare($query);
$stmt->bindParam('ssssi', $username, $firstname, $lastname, $email, $id);
$stmt->execute();
unset($_SESSION['username']);
unset($_SESSION['firstname']);
unset($_SESSION['lastname']);
unset($_SESSION['role']);
unset($_SESSION['email']);
unset($_SESSION['password']);
session_destroy();
header('Location: /panel/login?profile_changed');
} else {
header('Location: /panel/profile?username_taken');
}
} else {
header('Location: /panel/profile?email_taken');
}
}

Answer 1

$stmt = $pdo->prepare("SELECT * FROM users WHERE `email`=':email'");
$stmt->execute(['email' => $email]);
$user = $stmt->fetch();
/// update
$sql = "UPDATE users SET username=?, firstname=?, lastname=?, email=?
WHERE id=?";
$stmt= $pdo->prepare($sql);
$stmt->execute([$firstname, $lastname, $email, $id]);
or please read fully this article for complete understand
https://phpdelusions.net/pdo_examples/select