无法从wp_postmeta获取meta_value

Question

当帖子发布时，我已经在wordpress中编写了一个插件来执行操作 我正在使用 add_action（'save_post'，'user_sf_project'）操作。我可以从 wp_post 表中获取数据，但不能从 wp_postmeta 表。它显示为空。 需要帮助来获取 wp_postmeta

的值

这是我的代码。

add_action('save_post','user_sf_project');
function user_sf_project($post_id){

$SOAP_CLIENT_BASEDIR = plugin_dir_path(__FILE__).'Force.com-Toolkit-for-PHP/soapclient/';
require_once ($SOAP_CLIENT_BASEDIR.'/SforcePartnerClient.php');
require_once ($SOAP_CLIENT_BASEDIR.'/SforceHeaderOptions.php');
require_once ('Force.com-Toolkit-for-PHP/Samples/userAuth.php');

try {
  $mySforceConnection = new SforcePartnerClient();
  $mySoapClient =  $mySforceConnection->createConnection($SOAP_CLIENT_BASEDIR.'/partner.wsdl.xml');
  $mylogin = $mySforceConnection->login("username", "password");

  $postdata = get_post($post_id);
  $meta_values = get_post_meta( $post_id, 'salary', true );
  $fields = array (
    'Name' => $post_id,
    'First_Name__c' => $postdata->post_title,
    'Salary__c' => $meta_values,
  );

  $sObject = new SObject();
  $sObject->fields = $fields;
  $sObject->type = 'NewObject__c';

  $createResponse = $mySforceConnection->create(array($sObject));

  print_r($createResponse);

  $ids = array();
  foreach ($createResponse as $createResult) {
    print_r($createResult);
    array_push($ids, $createResult->id);
  }

} catch (Exception $e) {
echo $mySforceConnection->getLastRequest();
echo $e->faultstring;
}

我无法使用meta_key从wp_postmeta获取meta_value。 请告诉我我在代码中犯了什么错误。