Title: PHP Undefined Index Warning
Last modified: September 1, 2016

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# PHP Undefined Index Warning

 *  [B0RG](https://wordpress.org/support/users/b0rg/)
 * (@b0rg)
 * [9 years, 11 months ago](https://wordpress.org/support/topic/php-undefined-index-warning/)
 * Please use DEBUG when developing WordPress Plugins!
 * Undefined index: background in …/plugins/simple-fullscreen-responsive-slider/
   simple-fullscreen-responsive-slider.php on line 337
 * [https://wordpress.org/plugins/simple-fullscreen-responsive-slider/](https://wordpress.org/plugins/simple-fullscreen-responsive-slider/)

The topic ‘PHP Undefined Index Warning’ is closed to new replies.

 * ![](https://ps.w.org/simple-fullscreen-responsive-slider/assets/icon-256x256.
   png?rev=980033)
 * [Simple Fullscreen Responsive Slider](https://wordpress.org/plugins/simple-fullscreen-responsive-slider/)
 * [Frequently Asked Questions](https://wordpress.org/plugins/simple-fullscreen-responsive-slider/#faq)
 * [Support Threads](https://wordpress.org/support/plugin/simple-fullscreen-responsive-slider/)
 * [Active Topics](https://wordpress.org/support/plugin/simple-fullscreen-responsive-slider/active/)
 * [Unresolved Topics](https://wordpress.org/support/plugin/simple-fullscreen-responsive-slider/unresolved/)
 * [Reviews](https://wordpress.org/support/plugin/simple-fullscreen-responsive-slider/reviews/)

 * 0 replies
 * 1 participant
 * Last reply from: [B0RG](https://wordpress.org/support/users/b0rg/)
 * Last activity: [9 years, 11 months ago](https://wordpress.org/support/topic/php-undefined-index-warning/)
 * Status: not resolved