PHP Warning: usort():

@tetontrekker – As we have not had a report of this message being written to error_log files before, do you know what operations you are doing when they are being created?

– Cais.

I’m using it with a custom theme.
https://jhcband.org/photo-albums/

It looks like it happens when the page (or any of the albums) get a hit. I watch who’s on line when I’m working on pages, it looks like it happens when bots hit it too. This is new, it started after one of the recent updates.

My Query Monitor also has a PHP warning on that page:

Warning usort(): Array was modified by the user comparison function 2 wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/nextgen_gallery_display/package.module.nextgen_gallery_display.php:995 usort()
Mixin_Displayed_Gallery_Queries->_entities_to_galleries_and_albums()
ReflectionMethod->invokeArgs()
ExtensibleObject->_exec_cached_method()
ExtensibleObject->__call()
C_Displayed_Gallery->_entities_to_galleries_and_albums()
Mixin_Displayed_Gallery_Queries->_get_album_and_gallery_entities()
ReflectionMethod->invokeArgs()
ExtensibleObject->_exec_cached_method()
ExtensibleObject->__call()
C_Displayed_Gallery->_get_album_and_gallery_entities()
Mixin_Displayed_Gallery_Queries->get_entities()
ReflectionMethod->invokeArgs()
ExtensibleObject->_exec_cached_method()
ExtensibleObject->__call()
C_Displayed_Gallery->get_entities()
Mixin_Displayed_Gallery_Queries->get_included_entities()
ReflectionMethod->invokeArgs()
ExtensibleObject->_exec_cached_method()
ExtensibleObject->__call()
C_Displayed_Gallery->get_included_entities()
A_NextGen_Basic_Album_Controller->index_action()
ReflectionMethod->invokeArgs()
ExtensibleObject->_exec_cached_method()
ExtensibleObject->__call()
C_Display_Type_Controller->index_action()
Mixin_Displayed_Gallery_Renderer->render()
ReflectionMethod->invokeArgs()
ExtensibleObject->_exec_cached_method()
ExtensibleObject->__call()
ExtensibleObject->call_method()
Mixin->call_parent()
A_NextGen_Basic_Album_Routes->render()
ReflectionMethod->invokeArgs()
ExtensibleObject->_exec_cached_method()
ExtensibleObject->__call()
C_Displayed_Gallery_Renderer->render()
Mixin_Displayed_Gallery_Renderer->display_images()
ReflectionMethod->invokeArgs()
ExtensibleObject->_exec_cached_method()
ExtensibleObject->__call()
C_Displayed_Gallery_Renderer->display_images()
M_NextGen_Basic_Album->ngglegacy_shortcode()
C_NextGen_Shortcode_Manager->callback_wrapper()
C_NextGen_Shortcode_Manager->__call()
C_NextGen_Shortcode_Manager->album__callback()
do_shortcode_tag()
preg_replace_callback()
do_shortcode() Plugin: nextgen-gallery

I hope this helps,
Julie

It must be a conflict with another plug in. I’m using Next Gen on 2 other sites, I just did the updates and and it is not getting any errors or warnings.

@tetontrekker – Let us know what you find after checking for plugin conflicts … as it is, there is nothing specific in the log you pasted that points to anything in particular.

Thanks!

– Cais.