我正在尝试制作这样的东西

        if (!empty($name) && !empty($email) && !empty($office_id) && !empty($title) && !empty($story)) {

        $save_sql = "INSERT INTO `tbl_contest` (filename, name, email, office_id, title, story, time) VALUES ('$img_newname','$name','$email','$office_id','$title','$story','$sql_date')";

        $query = mysql_query($save_sql,$con) or die(mysql_error("Could not write information to the database")); 

        if (mysql_num_rows($con) !== 0) { 
        header('Location:' . $uploadSuccess.'#modal-text'); 
        if($user_id) {

          // We have a user ID, so probably a logged in user.
          // If not, we'll get an exception, which we handle below.
          try {
            $ret_obj = $facebook->api('/me/feed', 'POST',
                                        array(
                                          'link' => $post_link,
                                          'message' => 'Posting with the PHP SDK!'
                                     ));
            echo '
Post ID: ' . $ret_obj['id'] . '
';

            // Give the user a logout link 
            echo '
logout';
          } catch(FacebookApiException $e) {
            // If the user is logged out, you can have a 
            // user ID even though the access token is invalid.
            // In this case, we'll get an exception, so we'll
            // just ask the user to login again here.
            $login_url = $facebook->getLoginUrl( array(
                           'scope' => 'publish_stream'
                           )); 
            echo 'Please login.';
            error_log($e->getType());
            error_log($e->getMessage());
          }   
        } else {

          // No user, so print a link for the user to login
          // To post to a user's wall, we need publish_stream permission
          // We'll use the current URL as the redirect_uri, so we don't
          // need to specify it here.
          $login_url = $facebook->getLoginUrl( array( 'scope' => 'publish_stream' ) );
          echo 'Please login.';

        } 
        $get_id = $ret_obj['id'];
        $getid_sql = "INSERT INTO `tbl_contest` (post_id) VALUES ('$get_id')";
        $getquery = mysql_query($getid_sql,$con) or die(mysql_error("Could not write information to the database"));
        } 


        mysqli_close($con);
    }

我只是在前面的代码中添加了这 3 行代码：

        $get_id = $ret_obj['id'];
        $getid_sql = "INSERT INTO `tbl_contest` (post_id) VALUES ('$get_id')";
        $getquery = mysql_query($getid_sql,$con) or die(mysql_error("Could not write information to the database"));