the_post_thumbnail() echos a complete HTML <img> tag, not just the URL of the image. So, just use: <?php the_post_thumbnail ()?> rather than <img src=”https://wordpress.stackexchange.com/questions/259813/<?php the_post_thumbnail () ?>”>
In your case, you need to add custom fields to the metabox. The full reference code of the filter is here: ‘admin_post_thumbnail_html’ – https://developer.wordpress.org/reference/hooks/admin_post_thumbnail_html/. Let’s add an image title: <?php add_filter(‘admin_post_thumbnail_html’, ‘custom_featured_image_field’, 10, 2); function custom_featured_image_field($content, $post_id) { $custom_name = ‘custom_featured_image_title’; $custom_value = esc_attr(get_post_meta($post_id, $custom_name, true)); $output = sprintf( ‘<br><input type=“text” id=”%1$s” name=”%1$s” value=”%2$s”>’, $custom_name, … Read more
Make sure to use echo with get_the_post_thumbnail(): echo get_the_post_thumbnail(64 , ‘post-thumbnail’, array( ‘class’ => ‘img-format-big’ ) ); In WordPress, a rule of thumb (no pun intended) is to use echo with functions prefixed with get_. Functions prefixed with the_ on the other hand, display their output immediately (e.g. the_post_thumbnail() ).
As @belinus mentioned, you can assign multiple categories to a post, so you have to decide which one to pass to the_post_thumbnail(). One approach would be to use get_the_category(), which returns an array, then grabbing the first result from that function as your thumbnail size: $categories = get_the_category(); $thumbnail_cat = ! empty( $categories[0]->slug ) ? … Read more
I can’t speak for the size of the image, but I assume small images that have a dimension about 50px should have the size around 5 or 10kb. You can add your own custom size to your theme: add_image_size( ‘tiny-thumbnails’, 50, 50, true ); Setting the fourth parameter to true will force the WordPress to … Read more
You have to echo it out: echo get_the_post_thumbnail(); Perhaps you meant to use the_post_thumbnail(); https://developer.wordpress.org/reference/functions/the_post_thumbnail/
There is no clean way to do this. Each image stores image information in post meta table, but as a part of the serialized PHP string. Using MySQL for that is out of the question because MySQL doesn’t have a syntax for extracting regular expressions matched content, it can only use perform true/false/like expressions using … Read more
No it certainly doesn’t. It is simply a case of poor choice of naming. The function should have been named unset_post_thumbnail(), particularly when we already have set_post_thumbnail(). Today’s WordPress annoyance.
It appears you’ve taken the super long winded route and done each step of the upload manually. But why not use the sideloading function that does it all for you? The majority of your code can be replaced with this: // These files need to be included as dependencies when on the front end. require_once( … Read more
<?php $navMenu = wp_get_nav_menu_items(6); foreach ($navMenu as $menu) { echo ‘<li style=”background-image:url( ‘. get_the_post_thumbnail_url( $menu->object_id ) .’ )”>’; echo ‘<a href=”‘. $menu->url .'”>’. $menu->title .'</a>’; } ?>