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<?php
require 'db.php';
if (isset($_POST['username'])) {
$username = trim($_POST['username']);
$stmt = $conn->prepare("SELECT id FROM users WHERE username = ?");
$stmt->bind_param("s", $username);
$stmt->execute();
$stmt->store_result();
if ($stmt->num_rows > 0) {
echo "taken";
} else {
echo "available";
}
$stmt->close();
}
?>