Title: PHP Errors Last modified: August 22, 2017 --- # PHP Errors * Resolved Anonymous User 14978628 * (@anonymized-14978628) * [8 years, 9 months ago](https://wordpress.org/support/topic/php-errors-107/) * Hey Stefan, hope all is well with you. * I’ve noticed a few errors in my debug.log and was wondering what you make of them? Plugin seems to be functioning normally as far as i can tell. * [22-Aug-2017 05:43:36 UTC] PHP Notice: Undefined index: class in /responsify- wp/includes/custom_media_query_rules.php on line 58 * [22-Aug-2017 05:43:36 UTC] PHP Notice: Undefined index: class in /responsify- wp/includes/custom_media_query_rules.php on line 62 Viewing 6 replies - 1 through 6 (of 6 total) * Thread Starter Anonymous User 14978628 * (@anonymized-14978628) * [8 years, 9 months ago](https://wordpress.org/support/topic/php-errors-107/#post-9438069) * Looking in my debug i’ve also noticed the following errors: * PHP Notice: Undefined variable: post in /module-posts-blog-feed-loop.php on line 11 PHP Notice: Trying to get property of non-object in /module-posts-blog-feed- loop.php on line 11 * which relates to this line * `` * PHP Notice: Undefined variable: post in /module-posts-blog-feed-loop.php on line 13 * which relates to this line * `$thumbnail_id = get_post_thumbnail_id( $post->ID );` * The previous two errors * [22-Aug-2017 05:43:36 UTC] PHP Notice: Undefined index: class in /responsify- wp/includes/custom_media_query_rules.php on line 58 * [22-Aug-2017 05:43:36 UTC] PHP Notice: Undefined index: class in /responsify- wp/includes/custom_media_query_rules.php on line 62 * Relate to this section of code: * ``` public function image_size_equals( $attributes, $value ) { return is_integer( strpos($attributes['img']['class'], 'size-' . $value) ); } public function image_size_not_equals( $attributes, $value ) { return ! is_integer( strpos($attributes['img']['class'], 'size-' . $value) ); } ``` * Which i recognize because i’m using custom media queries within the plugin using both the if equals and not equals variables for 2 separate rules. * Plugin Author [stefanledin](https://wordpress.org/support/users/stefanledin/) * (@stefanledin) * [8 years, 9 months ago](https://wordpress.org/support/topic/php-errors-107/#post-9440126) * Hi Marty! Sorry for the late reply. I’ve noticed that the `` boxes and click save. Try that and see if the errors disappears! * The errors relating to `get_permalink()` and `get_post_thumbnail_id()` doesn’t have anything to do with RWP I think. * Thread Starter Anonymous User 14978628 * (@anonymized-14978628) * [8 years, 9 months ago](https://wordpress.org/support/topic/php-errors-107/#post-9441102) * Hey Stefan, no worries. Will try selecting again as you suggested and see if that fixes it. * The other errors were part of a custom code you once gave for me manual insertion into the theme: * ``` ID ); echo rwp_img( $thumbnail_id, array( 'sizes' => array('homepage-grid', 'homepage-tablet', 'homepage-phone' ), 'attributes' => array( 'sizes' => '(min-width: 1366px) 603px, (min-width: 1024px) 507px, (min-width: 667px) 1036px, (min-width: 568px) 603px, 507px', 'alt' => get_post_meta( $thumbnail_id, '_wp_attachment_image_alt', true) ) )); ?> ``` * And the errors relate to these lines: * `` * `$thumbnail_id = get_post_thumbnail_id( $post->ID );` * From what i could find online about the error i’m getting: * `PHP Notice: Undefined variable: post` * It seems to relate to the “$post” component. Actually, just searching this again now i found this ([https://stackoverflow.com/questions/11520795/undefined-variable-post-php-and-mysql](https://stackoverflow.com/questions/11520795/undefined-variable-post-php-and-mysql)) which suggests using $_POST instead of $POST. Will try that out. * Plugin Author [stefanledin](https://wordpress.org/support/users/stefanledin/) * (@stefanledin) * [8 years, 9 months ago](https://wordpress.org/support/topic/php-errors-107/#post-9443049) * `$post` and `$_POST` is two different things. `$post` is a global variable in WordPress which contains the data of the current post, on a single page or within a loop for example. [https://codex.wordpress.org/Function_Reference/$post](https://codex.wordpress.org/Function_Reference/$post)` $_POST` is a global PHP variable containing data that has been posted from a form. * `PHP Notice: Undefined variable: post` means that the code isn’t within a loop or on a single page. I can’t tell you any more without the whole context. This has nothing to do with RWP itself though. I might be lazy, but since it’s just a warning and nothing breaks, I wouldn’t worry to much about it. * Thread Starter Anonymous User 14978628 * (@anonymized-14978628) * [8 years, 9 months ago](https://wordpress.org/support/topic/php-errors-107/#post-9443515) * Ok, I’ve changed back Post to how it originally was. Using $_Post didn’t break anything, but it didn’t fix the issue either. * If this is just a warning and won’t break anything as you said then i’m happy to leave as is! Thanks! * Plugin Author [stefanledin](https://wordpress.org/support/users/stefanledin/) * (@stefanledin) * [8 years, 9 months ago](https://wordpress.org/support/topic/php-errors-107/#post-9446619) * Great! Viewing 6 replies - 1 through 6 (of 6 total) The topic ‘PHP Errors’ is closed to new replies. * ![](https://ps.w.org/responsify-wp/assets/icon-256x256.png?rev=1209208) * [Responsify WP](https://wordpress.org/plugins/responsify-wp/) * [Frequently Asked Questions](https://wordpress.org/plugins/responsify-wp/#faq) * [Support Threads](https://wordpress.org/support/plugin/responsify-wp/) * [Active Topics](https://wordpress.org/support/plugin/responsify-wp/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/responsify-wp/unresolved/) * [Reviews](https://wordpress.org/support/plugin/responsify-wp/reviews/) * 6 replies * 2 participants * Last reply from: [stefanledin](https://wordpress.org/support/users/stefanledin/) * Last activity: [8 years, 9 months ago](https://wordpress.org/support/topic/php-errors-107/#post-9446619) * Status: resolved