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Joseph Morgan
Published in : 2022-01-30

[solved] undefined $post->ID in WP_Query()


Hello everyone, I am facing weird error in my website I can see this error 

Warning: Undefined variable $post in /customers/2/5/e/ on line 21Warning: Attempt to read property "ID" on null in /customers/2/5/e/ on line 21

the file looks like 

<?php $args = ['post_type' => 'skills','status' => 'published','orderby' => 'date', 'order' => 'ASC','posts_per_page' => -1,];$count = 0;$posts = new WP_Query( $args );if( $posts->have_posts() ) :?> <div ><?php $count = 1 ;while($posts->have_posts()):$posts->the_post();?><div > <div > <?php if(get_the_post_thumbnail_url($post->ID)){ ?> <img src="<?php echo get_the_post_thumbnail_url($post->ID); ?>" alt="Image"> <?php } ?> <div > <h4><?php the_title(); ?></h4> </div> </div></div><?phpif($count % 6 == 0){echo "</div> <div class='skills_container'>";}$count++ ;endwhile;else:echo "<h3 style='text-align: center;'> No posts to show </h3>";endif;?>

This is the first time to see this error however that code is working fine on another server,
Please help


Mohamed Atef Date : 2022-01-30

Best answers


Best answers


Hi Joseph,
This might be a error because of a different PHP version or any Wordpress update, but anyway I got the issue & there are a simple way to figure this out,
You can figure this error by replacing $post->ID with a function to get the ID of the post inside the loop which is get_the_ID()
Your loop should looks like 

<?php while($posts->have_posts()):$posts->the_post();?><div > <div > <?php if(get_the_post_thumbnail_url(get_the_ID())){ ?> <img src="<?php echo get_the_post_thumbnail_url(get_the_ID()); ?>" alt="Image"> <?php } ?> <div > <h4><?php the_title(); ?></h4> </div> </div></div><?phpif($count % 6 == 0){echo "</div> <div class='skills_container'>";}$count++ ;endwhile;?>

Good luck!!

Joseph Morgan Date : 2022-01-30

Thank you so much! you are amazing

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