如何从具有PHP中现有子域cookie的子域读取主cookie?

问题描述：

当子域cookie和主域cookie同时存在时，我需要为子域使用主域cookie，因为它具有更高的优先级.

I need to use main domain cookies for my sub domains as with higher priority when both sub and main domain cookies exists.

问题是当我在 sub.domain.com 上并且存在Cookie时

The problem is when I'm on sub.domain.com and there exist cookies for

sub.domain.com
.domain.com

PHP全局$_COOKIE包含$_COOKIE['data'] == 'sub.domain.com'. 我想检查是否还有一个 .domain.com cookie并使用它.

The PHP global $_COOKIE contains $_COOKIE['data'] == 'sub.domain.com'. I would like to check if there is also a .domain.com cookie and use it.

当我位于具有现有子域cookie的子域中时，如何读取主cookie?

How do I read the main cookie when I'm on a sub domain with an existing sub domain cookie?

答

有一个$_SERVER ['HTTP_COOKIE']变量，它包含与一个大字符串同名的子域和主域cookie变量.在以下简单的代码段中，$cookie_variable数组将包含特定变量的两个值:

There is a $_SERVER ['HTTP_COOKIE'] variable that contains both sub domain and main domain cookie variables with the same name as one large string. In the following simple piece of code the $cookie_variable array will contain both values of specific variables:

if( 'sub.domain.com' == $_SERVER['HTTP_HOST']) {
  $var_name = 'somedata';
  $domains_counter = 0;
  foreach(explode(';', $_SERVER['HTTP_COOKIE']) as $cookie_variable_string) {
    if( false !== strpos($cookie_variable_string, $var_name.'=') ) {
      $cookie_variable[$domains_counter] = urldecode(
          trim(
              substr(
                  $cookie_variable_string, 
                  strpos($cookie_variable_string, $var_name) + strlen($var_name.'=')
              )
          )
      );
      $domains_counter++;
    }
  }
  var_dump($cookie_variable);
}

这是一个获取所有变量的函数:

Here's a function that gets all variables:

public static function get_http_cookie_variables() {
  $domains_counter = [];
  foreach(explode(';', $_SERVER['HTTP_COOKIE']) as $cookie_variable_string) {
    $key_value = explode('=', $cookie_variable_string);
    $cookie_var_name = trim($key_value[0]);
    if(is_null($domains_counter[$cookie_var_name])) {
      $domains_counter[$cookie_var_name] = 0;
    }
    $http_cookie_variables[$cookie_var_name][$domains_counter[$cookie_var_name]] = urldecode(trim($key_value[1]));
    $domains_counter[$cookie_var_name]++;
  }

  return $http_cookie_variables;
}

如何从具有PHP中现有子域cookie的子域读取主cookie?

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