Error when trying to get the columns of a three-columns gallery.

[virginthumb]

It seems the get_post_gallery function fails to retrieve the column count if it's 3.

First, create a gallery. Then, insert 2 or 3 or any number of images and set its column to 3.

Then, run this code in the context of a post (content.php / single.php will do):

<?php
$gallery = get_post_gallery( $post->ID, False );
$gallery_images = explode( ',', $gallery['ids'] );
var_dump( $gallery['columns'] );

It will come out as:

<b>Notice</b>:  Undefined index: columns in <b>C:\file.php</b> on line <b>45</b>

[virginthumb]

Big update.

Turns out this bug only happens when there are 2 galleries. Removing the second gallery fixes it, but still, get_post_gallery should get the first / "featured" gallery only.

[saimonh]

Yes, I can confirm this bug and have included a patch for this issue. Please have a look.

[ozgursar]

Test Report

Description

This report validates whether the indicated patch works as expected.

Patch tested: https://core.trac.wordpress.org/attachment/ticket/44394/patch.diff

Environment

• WordPress: 7.0-alpha-61215-src
• PHP: 8.2.29
• Server: nginx/1.29.4
• Database: mysqli (Server: 8.4.7 / Client: mysqlnd 8.2.29)
• Browser: Chrome 143.0.0.0
• OS: macOS
• Theme: Twenty Twenty-One 2.7
• MU Plugins: None activated
• Plugins:
  • Classic Editor 1.6.7
  • Test Reports 1.2.1

Steps to Reproduce

1. Install and active classic editor
2. Add a new post
3. Create a gallery with 3 images and choose 3 columns
4. Add the following snippet to single.php

$gallery = get_post_gallery( $post->ID, False );
$gallery_images = explode( ',', $gallery['ids'] );
var_dump( $gallery['columns'] );

Actual Results

1. ❌ Issue did not resolve with patch.

Additional Notes

• When I test the use case code provided by the reporter, I get the same error before and after applying the patch.

Supplemental Artifacts

Before applying patch:

After applying patch: