Title: PHP Warning: usort(): Last modified: August 22, 2016 --- # PHP Warning: usort(): * [tetontrekker](https://wordpress.org/support/users/tetontrekker/) * (@tetontrekker) * [11 years ago](https://wordpress.org/support/topic/php-warning-usort/) * I don’t seem to be having any problems with the NextGen plug in or any of my public galleries but I keep getting warnings in my error log, the time in my error log is not set to my time zone but these just happened. I posted the last few, but I have 22 since yesterday. I have been installing the NextGen updates as soon as I see them on my list. * Mar 20, 21:51:45 PHP Warning: usort(): Array was modified by the user comparison function in /wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/ nextgen_gallery_display/package.module.nextgen_gallery_display.php on line 995 Mar 20, 21:51:45 PHP Warning: usort(): Array was modified by the user comparison function in /wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/ nextgen_gallery_display/package.module.nextgen_gallery_display.php on line 995 Mar 20, 21:51:59 PHP Warning: usort(): Array was modified by the user comparison function in /wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/ nextgen_gallery_display/package.module.nextgen_gallery_display.php on line 995 Mar 20, 21:51:59 PHP Warning: usort(): Array was modified by the user comparison function in /wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/ nextgen_gallery_display/package.module.nextgen_gallery_display.php on line 995 Mar 20, 21:51:59 PHP Warning: usort(): Array was modified by the user comparison function in /wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/ nextgen_gallery_display/package.module.nextgen_gallery_display.php on line 995 Mar 20, 21:51:59 PHP Warning: usort(): Array was modified by the user comparison function in /wp-content/plugins/nextgen-gallery/products/photocrati_nextgen/modules/ nextgen_gallery_display/package.module.nextgen_gallery_display.php on line 995 * [https://wordpress.org/plugins/nextgen-gallery/](https://wordpress.org/plugins/nextgen-gallery/) Viewing 4 replies - 1 through 4 (of 4 total) * Plugin Contributor [photocrati](https://wordpress.org/support/users/photocrati/) * (@photocrati) * [11 years ago](https://wordpress.org/support/topic/php-warning-usort/#post-5923214) * [@tetontrekker](https://wordpress.org/support/users/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. * Thread Starter [tetontrekker](https://wordpress.org/support/users/tetontrekker/) * (@tetontrekker) * [11 years ago](https://wordpress.org/support/topic/php-warning-usort/#post-5923216) * I’m using it with a custom theme. [http://jhcband.org/photo-albums/](http://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 * Thread Starter [tetontrekker](https://wordpress.org/support/users/tetontrekker/) * (@tetontrekker) * [11 years ago](https://wordpress.org/support/topic/php-warning-usort/#post-5923219) * 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. * Plugin Contributor [photocrati](https://wordpress.org/support/users/photocrati/) * (@photocrati) * [11 years ago](https://wordpress.org/support/topic/php-warning-usort/#post-5923221) * [@tetontrekker](https://wordpress.org/support/users/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. Viewing 4 replies - 1 through 4 (of 4 total) The topic ‘PHP Warning: usort():’ is closed to new replies. * ![](https://ps.w.org/nextgen-gallery/assets/icon-256x256.png?rev=2083961) * [Photo Gallery, Sliders, Proofing and Themes - NextGEN Gallery](https://wordpress.org/plugins/nextgen-gallery/) * [Frequently Asked Questions](https://wordpress.org/plugins/nextgen-gallery/#faq) * [Support Threads](https://wordpress.org/support/plugin/nextgen-gallery/) * [Active Topics](https://wordpress.org/support/plugin/nextgen-gallery/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/nextgen-gallery/unresolved/) * [Reviews](https://wordpress.org/support/plugin/nextgen-gallery/reviews/) ## Tags * [usort](https://wordpress.org/support/topic-tag/usort/) * 4 replies * 2 participants * Last reply from: [photocrati](https://wordpress.org/support/users/photocrati/) * Last activity: [11 years ago](https://wordpress.org/support/topic/php-warning-usort/#post-5923221) * Status: not resolved