1-您可以检查Cookie并使用在任何输出之前调用的挂钩（如“init”挂钩）进行重定向：

<?php

// Hook the function "redirect()" on to the "init" action
add_action(\'init\', \'redirect\');

// redirect() may redirect the user depending on the cookies he has
function redirect(){
  /* CODE */
}

?>

<?php

add_action(\'init\', \'my_setcookie\');

// my_setcookie() set the cookie on the domain and directory WP is installed on
function my_setcookie(){
  $path = parse_url(get_option(\'siteurl\'), PHP_URL_PATH);
  $host = parse_url(get_option(\'siteurl\'), PHP_URL_HOST);
  $expiry = strtotime(\'+1 month\');
  setcookie(\'my_cookie_name_1\', \'my_cookie_value_1\', $expiry, $path, $host);
  /* more cookies */
  setcookie(\'my_cookie_name_2\', \'my_cookie_value_2\', $expiry, $path, $host);
}

?>

www.example。com www.example。com/store示例。com www.www2。实例com

---

更新

您还应该能够使用COOKIE\\u路径和COOKIEDOMAIN常量，而不是自己计算出来，我刚刚在Andre R Kohl的回答中注意到了这一点-drzaus

您可能应该使用常量COOIKEPATH 和COOKIE_DOMAIN, 自WP 3.0起存在

setcookie("your_cookie", $your_value, time()+3600, COOKIEPATH, COOKIE_DOMAIN);

This way worked :

    add_action( \'init\', \'function-to-setcookie\' ); 

    function function-to-setcookie(){

        //use condition here , in which page you eant to set cookie
        //choose a page where you want the cookie to be set
        $pageurl = get_option(\'siteurl\').\'/set-cookie-page\'; 

       // use a function to get current page url and use condition 
       //to match it with the desired page where you want to set cookie 
       if ( $pageurl === current_page_url() ) {
           setcookie( \'cookie_name\', \'cookie_value\', $expiryTime, $cookiepath, $siteurl );
         }

    }

在将任何内容写入页面之前（在发送标题之前），您需要删除cookie。

要设置cookie，请包括路径、域，我还建议将最后2个参数设置为true($secure 和$httponly). 您还需要将相同的参数提供给setcookie() 删除时，除了$expiry （应该是负数）和$value （应为空“”）。

如果要通过cookie传递json，似乎需要base64_encode 它也是，否则它将无法正确解码。

所有这些都应该在一个类中完成，这样您以后就可以在代码中访问cookie的值。该类可以添加到插件或函数中。php。

下面是一个示例，我们使用cookie存储操作响应，然后在重定向后将其显示给用户：

class my_custom_class {

    const MY_COOKIE_NAME_JSON = \'my_cookie_name_json\';
    const COOKIE_LIFETIME = 3600;

    private $cookie_value;

    function __construct() {
        // ensure you are deleting cookie before headers are sent
        add_action(\'init\', [$this, \'process_cookie_json\'], 10);
        // uses bootstrap alert to format return message
        add_filter(\'the_content\', [$this, \'filter_the_content_in_the_main_loop\'], 1);
    }
    
    static function some_action_that_sets_the_cookie($message, $response_type = \'success\') {
        $responses = [];
        if (isset($_COOKIE[self::MY_COOKIE_NAME_JSON]))
            $responses = json_decode(base64_decode($_COOKIE[self::MY_COOKIE_NAME_JSON]));
        $responses[$response_type][] = $message;
        self::set_cookie_json($responses);
    }
    
    static function set_cookie_json(array $cookie_value) {
        setcookie(self::MY_COOKIE_NAME_JSON, base64_encode(json_encode($cookie_value)), time() + self::COOKIE_LIFETIME, "/", $_SERVER[\'HTTP_HOST\'], true, true);
    }
    
    function process_cookie_json() {
        if (!isset($_COOKIE[self::MY_COOKIE_NAME_JSON]))
            return false;
        $this->cookie_value = json_decode(base64_decode($_COOKIE[self::MY_COOKIE_NAME_JSON]), true);
        setcookie(self::MY_COOKIE_NAME_JSON, \'\', -1, "/", $_SERVER[\'HTTP_HOST\'], true, true);
        unset($_COOKIE[self::MY_COOKIE_NAME_JSON]);
    }

    function filter_the_content_in_the_main_loop($content) {
        if (!$this->cookie_value || !is_array($this->cookie_value))
            return $content;
        $alerts = [];
        foreach ($this->cookie_value as $response_type => $messages)
            $alerts[] = \'<div class="alert alert-\' . $response_type . \'" role="alert">\' . implode(PHP_EOL, $messages) . \'</div>\';
        return implode(null, $alerts) . $content;
    }

}

$my_custom_class = my_custom_class;

my_custom_class::some_action_that_sets_the_cookie(\'the message\');