Сохранение полей формы после перезагрузки

Сохранение полей формы после перезагрузки формы на PHP.

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<?PHP
session_start();
if (isset($_POST['user_name'])) {$_SESSION['user_name'] = $_POST['user_name']; $user_name = $_SESSION['user_name'];}
if (!isset($user_name)) { } else {$user_name;};
      
if (isset($_POST['user_phone'])) {$_SESSION['user_phone'] = $_POST['user_phone']; $user_phone = $_SESSION['user_phone'];}
if (!isset($user_phone)) { } else {$user_phone;};
      
if (isset($_POST['user_email'])) {$_SESSION['user_email'] = $_POST['user_email']; $user_email = $_SESSION['user_email'];}
if (!isset($user_email)) { } else {$user_email;};
      
if (isset($_POST['MESSAGE'])) {$_SESSION['MESSAGE'] = $_POST['MESSAGE']; $message = $_SESSION['MESSAGE'];}
if (!isset($messagel)) { } else {$message;};
?>
 
 
<form action="" method="POST" name="form">
<div class="form-group">
   <label for="fio-input">Имя<span class="mf-req">*</span></label>
   <input type="text" class="form-control" id="fio-input" placeholder="Иванов Иван Иванович"  name="user_name" value="<?=$user_name;?>">
</div>
<div class="form-group">
   <label for="tel-input">Телефон<span class="mf-req">*</span></label>
   <input type="text" class="form-control" id="tel-input" placeholder="+7 926 1234567" name="user_phone" value="<?=$user_phone;?>">
</div>
<div class="form-group">
   <label for="email-input">E-mail<span class="mf-req">*</span></label>
   <input type="email" class="form-control" id="email-input" placeholder="name@site.ru" name="user_email" value="<?=$user_email;?>">
</div>
<div class="form-group">
   <label for="msg-input">Сообщение<span class="mf-req">*</span><?endif?></label>
   <textarea id="msg-input" class="form-control" rows="5" name="MESSAGE"><?=$message;?></textarea>
</div>
</form>