我有一个PHP表单，我想适应WordPress。我做了一个插件，创建了一个小部件和一个表单。表单操作转到我创建的一个名为listrak-newsletter-api.php 但当我以下面的形式提交时，我得到了一个404错误。

这些文件都位于/wp-content/plugins/listrak-newsletter-api 目录

单独使用，在WordPress之外，这非常有效。但自从将其迁移到WordPress之后，它变得非常复杂。我以前有一个简单的HTML页面，其中的表单有一个表单操作listrak-newsletter-api.php 这很有效。但把这一点纳入WordPress似乎让它变得有点困难。

现在，我想把它作为一个小部件，因为我可以把小部件放在我想要的地方，放在WordPress主题的边栏上。当我激活它时，它在哪里显示以及如何显示都很好。功能只是需要发挥作用。

此文件是/wp-content/plugins/listrak-newsletter-api/plugin.php :

<?php

/**
* Plugin Name: Listrak Newsletter API
* Description: Newsletter integration with Listrak.
* Version: 1.0
*/

// Register and load the widget
function wpb_load_widget()
{
    register_widget(\'wpb_widget\');
}
add_action(\'widgets_init\', \'wpb_load_widget\');

// Creating the widget 
class wpb_widget extends WP_Widget
{

    function __construct()
    {
        parent::__construct(
        // Base ID of your widget
            \'wpb_widget\', 
        // Widget name will appear in UI
            __(\'WPBeginner Widget\', \'wpb_widget_domain\'), 
        // Widget description
            array(
            \'description\' => __(\'Sample widget based on WPBeginner Tutorial\', \'wpb_widget_domain\')
        ));
    }

    // Creating widget front-end

    public function widget($args, $instance)
    {
        $title = apply_filters(\'widget_title\', $instance[\'title\']);

        // before and after widget arguments are defined by themes
        echo $args[\'before_widget\'];        

        // This is where you run the code and display the output
        echo \'<div class="block-title"><span>EMAIL NEWSLETTER</span></div>\';
        echo \'<form action="/wp-content/plugins/listrak-newsletter-api.php" method="post">\';
        echo \'  <div class="tnp-field tnp-field-email"><label>Email</label>\';
        echo \'  <input class="email" name="email" required="" type="email"></div>\';     
        echo \'  <div class="tnp-field tnp-field-button"><input class="tnp-submit" value="Subscribe now!" type="submit"></div>\';
        echo \'</form>\';
        echo $args[\'after_widget\'];
    }

    // Widget Backend 
    public function form($instance)
    {
        if (isset($instance[\'title\'])) {
            $title = $instance[\'title\'];
        } else {
            $title = __(\'New title\', \'wpb_widget_domain\');
        }
        // Widget admin form
        ?>
        <p>
        <label for="<?php
                echo $this->get_field_id(\'title\');
        ?>"><?php
                _e(\'Title:\');
        ?></label> 
        <input class="widefat" id="<?php
                echo $this->get_field_id(\'title\');
        ?>" name="<?php
                echo $this->get_field_name(\'title\');
        ?>" type="text" value="<?php
                echo esc_attr($title);
        ?>" />
        </p>
        <?php
    }

    // Updating widget replacing old instances with new
    public function update($new_instance, $old_instance)
    {
        $instance          = array();
        $instance[\'title\'] = (!empty($new_instance[\'title\'])) ? strip_tags($new_instance[\'title\']) : \'\';
        return $instance;
    }
} // Class wpb_widget ends here

?>

<?php

$host = $_SERVER[\'HTTP_HOST\'];

if (isset($_POST[\'action\'])) {

    $email = $_POST[\'email\']; //obtain email from post, place into $email variable
    $email = filter_var($email, FILTER_SANITIZE_EMAIL); //sanitizing email
    //$theAction = $_POST[\'action\'];
    //wpSubscription($host, $email, $theAction);
    //$redirect = $_POST[\'redirect\'];
    //header(\'Location: \' . $redirect);    

    if ($_POST[\'email\'] == \'\') {
        echo "Please enter an email address";
    }
    if ($host == network_site_url()) {
        $sh_param   = array( //setting username & password array
            \'UserName\' => "",
            \'Password\' => ""
        );
        $authvalues = new SoapVar($sh_param, SOAP_ENC_OBJECT); //encoding username and password array
        $headers[]  = new SoapHeader("http://webservices.listrak.com/v31/", \'WSUser\', $sh_param);
        $soapClient = new SoapClient("https://webservices.listrak.com/v31/IntegrationService.asmx?WSDL", array(
            \'trace\' => 1,
            \'exceptions\' => true,
            \'cache_wsdl\' => WSDL_CACHE_NONE,
            \'soap_version\' => SOAP_1_2
        ));

        $soapClient->__setSoapHeaders($headers);
        $params = array( //parameters for soap xml integration with listrak
            \'WSContact\' => array(
                \'EmailAddress\' => $email,
                \'ListID\' => \'\'
            ),
            \'ProfileUpdateType\' => \'Overwrite\',
            \'ExternalEventIDs\' => \'\',
            \'OverrideUnsubscribe\' => true
        );

        try {

            $rest = $soapClient->SetContact($params); //using SetContact method, send parameters

        }
        catch (SoapFault $e) { //if an error occurs, display it

            echo \'<pre>\';

            print($e->getMessage());

            echo \'</pre>\';
        }
    }
}
?>