我做了一个插件来创建一个当cookie为FALSE时的。实际上，正在工作，但当我准备创建cookie时，它说我的头已经发送了。

然后，我有了密码add_action(\'init\', \'newsletterSuscriber\'); 但它仍然返回了这样一个错误。

警告：call\\u user\\u func\\u array（）要求参数1为有效回调，在/PATH/wp includes/plugin中找不到函数“newslettessuscriber”，或函数名无效。php在线503

Plugin code

    class Okidoo_Newsletter_Suscriber {

    /**
    * Initializes the plugin.
    *
    * To keep the initialization fast, only add filter and action in the constructor.
    */

    public function __construct() {

        add_shortcode( \'custom-suscribe-form\' , array( $this, \'render_suscribe_form\') );

        add_action( \'init\', \'newsletterSuscriber\' );
    }



    /**
    * A shortcode for rendering the login form.
    *
    * @param    array   $attributes     Shortcode attributes.
    * @param    array   $content        The text content for shortcode. Not used.
    * 
    * @return   string                  The shortcode output
    */

    public function render_suscribe_form( $attributes, $content = null ) {

        // Parse shortcode attributes
        $default_attributes = array( \'show_title\' => false );
        $attributes = shortcode_atts( $default_attributes, $attributes );
        $show_title = $attributes[\'show_title\'];

        // Pass the redirect parameter to the WordPress login functionnality : by default,
        // don\'t specify a redirect, but if a valid redirect URL has been passed as 
        // request parameter, use it.
        $attributes[\'redirect\'] = \'\';

        // Render the login form using an external template.
        return $this->get_template_html( \'subscription_form\', $attributes );
    }


    /**
    * Render the contents of the given template to a string and returns it.
    * @param    string  $template_name  The name of the template to render (without .php)
    * @param    array   $attributes     The PHP variables for the template
    *
    * @return   string                  The contents of the template.
    */
    private function get_template_html( $template_name, $attributes = null ) {
        if ( ! $attributes ) {
            $attributes = array();
        }

        ob_start();

        do_action( \'personalize_div_before_\' . $template_name );

        require( \'templates/\' . $template_name . \'.php\' );

        do_action( \'personalize_div_before_\' . $template_name );

        $html = ob_get_contents();

        ob_end_clean();

        return $html;
    }

    public function newsletterSuscriber() {
        if ( ! isset($_COOKIE[\'newsletter_suscriber\'])) {

            $path = parse_url(get_option(\'siteurl\'), PHP_URL_PATH);
            $host = parse_url(get_option(\'siteurl\'), PHP_URL_HOST);
            $expiration = time() + 3600;

            setcookie(\'newsletter_suscriber\', \'newsletter_suscriber\', $expiration, $path, $host);
        }
    }

}

// Initialize the plugin
$initialisation = new Okidoo_Newsletter_Suscriber();

之后，我尝试将add\\u操作放在mey函数上。php文件在模板中，也可以直接在插件文件中。

任何人都可以告诉我是否有可能：

使用init操作执行插件

add_action( \'init\', [ $this, \'newsletterSuscriber\' ] );