如何使用php将数字打印/回显到复选框

<form method="POST" action="">
  <input type="checkbox" name="number[]" value="1"> 1
  <input type="checkbox" name="number[]" value="2"> 2
  <input type="checkbox" name="number[]" value="3"> 3
  <input type="submit" value="Submit">
</form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
  if (isset($_POST["number"])) {
    $selectedNumbers = $_POST["number"];
    foreach ($selectedNumbers as $number) {
      echo '<input type="checkbox" name="number[]" value="' . $number . '" checked>' . $number;
    }
  }
}
?>