Get Just the Comment Form in Multisite for Any Blog

What are you doing, that you can’t call the comment form in the page like normal?

switch_to_blog($blogid) may be failing because it’s outside of WP and, as such, doesn’t know what blog it’s on.

Hi Ipstenu! So we meet again ?? I can’t call the comment form from the page like normal because I have a mobile application that reads in a RSS feed. I want the users to be able to comment if they’d like to so I would need to load just the comment form when they want it. Since I’m not actually at the page with the information, I need to send a request to get that information. I figured the easiest way would be to do it this way and I have gotten it to work great in a single installation environment.

The switch_to_blog() function seems to be working because when I add these lines after the call I get the correct blog name:

$current_blog_details = get_blog_details( array( 'blog_id' => $blog_id ) );
echo $current_blog_details->blogname;

However, once I try to do:

echo get_the_title($postid); // Title of the post we are commenting on
comment_form( $arg , $postid );

I get the default blog, instead of the switched to blog.

I’ve read that requiring wp-blog-header.php will put you inside WP so this would explain why switch_to_blog is workin as far as doing array calls. (FYI, I defined wp_use_themes as false because then I have just a straight up plain page with no styling)

I hope this information helps.

Alright, after talking this through with someone else, this actually works fine as is! Here’s how to do it:

1. I simplified the code without the blog id and switching. Here’s what it looks like:

<?php

// Need to be in WP's Loop but without theme
define('WP_USE_THEMES', false);
require('wp-blog-header.php');

$postid = $_GET['p'];

// Check to see if the post exists
if ( is_single( $postid )) {
	echo get_the_title($postid); // Title of the post we are commenting on
	comment_form( $arg , $postid );
}
else
	echo "Post doesn't exist!";

?>

2. I then access the file using the URL separation (sub-domain or sub-directory) instead of the base location. So for me it’s by sub-directory and looks like this: https://mydomain.com/us/wp-get-comment-form.php?p=34 Before I was trying to access it by https://mydomain.com/wp-get-comment-form.php?p=34&b=9 – I forgot that the logical separations still treats what’s physical files are at the base location as if it’s in sub-directory or sub-domain location!