致命错误：无法为所有功能重新声明功能

Question

我想我有一个错误的联系表格已经工作了2个月，现在突然间说：

  

致命错误：无法重新声明功能（之前在...中声明）

我已经尝试逐个关闭这些功能，但它只是为下一个功能提供相同的错误。我的代码很标准。但是，这里是(this is the beginning of the function. The code is long)         //功能     

  function e($value)
  {
     return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
  }

  //---------die dump function----------
  function dd($data)
  {
      die(var_dump($data));
  }

   //Booking Page code (beginning)
   <?php
   require 'includes/config.php';

   $name = $email = $date = $phone = $age = $tour = $message = '';
   $errors = [];


  if ($_SERVER["REQUEST_METHOD"] == "POST") {


  $name = e($_POST['name']);
  $email = e($_POST['email']);
  $tour = !empty($_POST['tour']) ? $_POST['tour'] : '';
  $phone = e($_POST['phone']);
  $date = e($_POST['date']);
  $age = e($_POST['age']);
  $message = e($_POST['message']);

  $errors['name'] = checkNameBooking($name);
  $errors['email'] = checkEmailBooking($email);
  $errors['tour'] = checkTourBooking($tour);
  $errors['date'] = checktimeBooking($date);
  $errors['age'] = checkAgeBooking($age);