Check if a variable is posted and show value

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<?php
  $items = array("name", "email","age"); //Assuming these fields
  
  foreach($items as $item){
    $val = (isset($_POST[$item])) ? $_POST[$item] : "";
    //You might want to prevent MySQL injections by real_escape or use PDO prepare for safety.
      echo "<input type='text' name='$item' value='$val' />";
  }
?>