the_ID() echoes its value, you can’t use it in that context. Change it to get_the_ID().
Many functions in WordPress follow this pattern- one function will print, while the same function with get_ prepended will return its value.
Related Posts:
- Can the Next/Prev Post links be ordered by menu order or by a meta key?
- Meta query with boolean true/false value
- Custom field values deleted when trashing custom post type
- Custom Post type – how to get checkbox to update meta field to null
- How do I Paginate Search Results for Custom Post Types?
- Ordering posts having multiple post-meta date fields
- How do I remove all the metaboxes for a custom post type?
- Custom Queries: Joining On Meta Values From Two Custom Post Types
- How to programmatically create a connection with [Plugin: Posts 2 Posts] on cpt publish?
- Grossly inefficient wordpress loops!
- How Do I Use WP_Query to Run This Database Query as Search Result?
- WordPress Admin Panel search posts with custom post meta values along with title
- Rest Api v2 orderby meta_key in custom post type
- Custom post type category not displaying in custom post type
- How to make custom post meta wp_editor translatable?
- How to add multiple featured image in meta box in post editor?
- update_post_meta() whenever custom post type is updated
- Formatting custom meta box date from YYYY/MM/DD to a more readable alternative
- How to best delete orphan wp_postmeta
- Count posts with specific term_meta
- Custom search for custom post meta with pre_get_posts interferes with WP search
- WordPress Orderby Numeric Value Not Working
- Replace title column in post list with post meta value
- My theme saves their custom post type’s metadata as a serialized array, how to access the keys?
- List all images from a single post meta value
- Does WordPress limit the length of slug names for Post Meta or Terms?
- Insert Multiple Post with Same Publish Button
- Undefined Variable – Custom Post Type Meta
- Ordering posts in Search & taxonomy by post_meta
- how to delete all users and posts based on ‘user_meta’?
- Post image in WordPress not appearing on home page
- changing meta value and meta key of price field
- Posting to a Custom Post Type from front end – user generated content
- Update Post Meta for a logged in user
- Getting meta in editor plugin, and event triggering issue
- Restrict Access to Posts based on Custom User and Post Meta Data
- Metabox not show in categories custom post type cmb2
- Custom fields for custom post type
- Is there a way to exclude posts based on meta_values?
- Submitting Custom Post Types with custom fields from Front-end form
- create custom meta box with default value
- How to Echo Metadata Value in Currency Format
- Filter posts by tax (dropdown) and meta value
- Publish and save specific postmeta to a filtered post_type
- How to move a post to different post type with all meta data?
- WP API Response does not show my registered metadata
- How to detect that the save_post hook is calling the callback associated to the current edit post page only
- Batch Extract Date from post title and put into ACF custom field
- How to handle this specific case of custom post type?
- Save CTP post meta different values each day without overwriting previous values
- get_post_meta returns NULL in front-end, but correct result in back-end
- Problem with adding custom post type meta to header by plugin
- Meta box data is saved but NOT displayed in the meta box text field. Why?
- Echo custom post meta from options array
- Get all metadata for a given custom post type
- WP_Meta_Query object with conditionals
- Trying to write shortcode with get_post_meta but isn’t working
- Advanced custom field – posted fields from custom post type
- HM CMB: Post Select Field for CPT ID
- updating one custom meta field only
- Add a class to post_class if more than one post shares same meta_value_num
- Function to return values from metabox
- Add a meta field to the list of results for a custom post type
- Problem Saving Custom Post Type Meta Values
- Custom fields for post or terms which don’t update on post update
- Should I use a custom taxonomy or custom post type for grouping a list of panels associated with a group of tests?
- How to use multiple Meta Field from CPT as Post permalink
- Show posts from WP Custom Post Type selected from a field in a metabox
- Creating an archive page or simple template to list all values of a custom field of specific post type listing
- Peepso: Add extra data field (custom post meta) to postbox
- Change picture attachment meta of all occurrences of a picture
- Unknown Post Meta Records
- Get Previous Post based on Custom Field Name, for Custom Post Type
- Saving custom post types post_meta over REST-API fails
- add action save post type and update post meta woocommerce
- get_post_meta not working with variable as a post_id for dynamically get the postid
- How to get post detail based on URL of the post
- Linking posts together with Advanced Custom Fields “both ways”
- Add more custom fields when creating a new custom post type
- Stripe multiple transactions
- How to get Current week and current date record wp query
- Edit is changing my custom’s post type parent id
- Disable Facebook Comments Automatically On CPT
- How to add post reference field to a plugin?
- Problem with ‘save_post’ hook not running
- WordPress custom post type
- Edit post meta direct from post.php?
- Howto: use existing post_meta as options for a different metabox (checkboxes or list)
- Custom Post Type meta oembed html output resulting in WSoD
- Timetable of Custom Meta Data using Custom Post Type and Custom Taxonomy
- Change the contents of a dropdown through the admin panel?
- Top 30 Songs using Custom Post Type
- Advice Needed for Post Meta Database Efficiency
- fetch meta fields inside a widget
- Custom post type – update_meta not working
- Use a Variable in update_post_meta as the $meta_key
- Update an existing post in a custom post type
- Post Meta for Custom Post Types
- getEntityRecords/useEntityRecords: How to use CPT metadata?
- CPT meta values intermittently return empty