PHP warning: Warning: Invalid argument supplied for foreach()

I have an idea as to what might cause this error. Maybe when I cloned the live site to create the dev site, some file paths might not have been properly updated?

I was able to create a NEW photo gallery, here: http://urban.mattsson.pro/photo-gallery-2/. Once I added new and different photos to this new gallery, the PHP warning message disappeared.

You may close this issue. However I hope this thread will help others who see this PHP warning, to understand want is causing it.

Cheers,
Carol

Hello Weblizar,

Thank you for your quick response and for the new file. I installed it. Then, I added a new image to my test photo gallery, it seems to work OK. However the old code worked just fine with my test gallery as well.

Looking at the original gallery, the PHP error message no longer appears, I only see the 9 blank photos. So that is an improvement.

A tip, the new file you gave me contained a blank line at the top, so at first I got PHP errors on every admin page “Warning: Cannot modify header information – headers already sent by (output started at /home/obfuscated/public_html/urban/wp-content/plugins/responsive-photo-gallery/responsive-gallery-short-code.php:1) in /home/obfuscated/public_html/urban/wp-admin/includes/misc.php on line 1116.”

I removed the blank line then the error messages no longer appeared.

Another tip, the new file contains no version information (at least not near the top of the file where I expect to see it). So there’s nothing to identify which plugin it belongs to or which version, or that it’s a special patch.

One more thing, it turns out that the website owner actually no longer needs this photo gallery on the website, so I’m about to remove the link to it.

Thanks again for your help.
–Carol