set_post_thumbnail( int|WP_Post $post, int $thumbnail_id ): int|bool

Sets the post thumbnail (featured image) for the given post.

Contents

Parameters

$post int|WP_Post Required
Post ID or post object where thumbnail should be attached.
$thumbnail_id int Required
Thumbnail to attach.

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Return

int|bool True on success, false on failure.

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Source

File: wp-includes/post.php. View all references 

function set_post_thumbnail( $post, $thumbnail_id ) {
	$post         = get_post( $post );
	$thumbnail_id = absint( $thumbnail_id );
	if ( $post && $thumbnail_id && get_post( $thumbnail_id ) ) {
		if ( wp_get_attachment_image( $thumbnail_id, 'thumbnail' ) ) {
			return update_post_meta( $post->ID, '_thumbnail_id', $thumbnail_id );
		} else {
			return delete_post_meta( $post->ID, '_thumbnail_id' );
		}
	}
	return false;
}

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Uses

Uses
Uses Description
update_post_meta() wp-includes/post.php

Updates a post meta field based on the given post ID.
wp_get_attachment_image() wp-includes/media.php

Gets an HTML img element representing an image attachment.
delete_post_meta() wp-includes/post.php

Deletes a post meta field for the given post ID.
absint() wp-includes/functions.php

Converts a value to non-negative integer.
get_post() wp-includes/post.php

Retrieves post data given a post ID or post object.
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Used By

Used By
Used By Description
WP_REST_Posts_Controller::handle_featured_media() wp-includes/rest-api/endpoints/class-wp-rest-posts-controller.php

Determines the featured media based on a request param.
wp_ajax_set_attachment_thumbnail() wp-admin/includes/ajax-actions.php

Ajax handler for setting the featured image for an attachment.
wp_ajax_set_post_thumbnail() wp-admin/includes/ajax-actions.php

Ajax handler for setting the featured image.
wp_insert_post() wp-includes/post.php

Inserts or update a post.
wp_xmlrpc_server::mw_editPost() wp-includes/class-wp-xmlrpc-server.php

Edit a post.
wp_xmlrpc_server::mw_newPost() wp-includes/class-wp-xmlrpc-server.php

Create a new post.
wp_xmlrpc_server::_insert_post() wp-includes/class-wp-xmlrpc-server.php

Helper method for wp_newPost() and wp_editPost(), containing shared logic.
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Changelog

Changelog
Version Description
3.1.0 Introduced.

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User Contributed Notes

  1. Skip to note 1 content
    You must log in to vote on the helpfulness of this noteVote results for this note: 4You must log in to vote on the helpfulness of this note
    Contributed by Aurovrata Venet —

    To programmatically setup an uploaded image file as a thumbnail, you can use the following code…

    /*
 * $file is the path to your uploaded file (for example as set in the $_FILE posted file array)
 * $filename is the name of the file
 * first we need to upload the file into the wp upload folder.
 */
$upload_file = wp_upload_bits( $filename, null, @file_get_contents( $file ) );
i
f ( ! $upload_file['error'] ) {
  // if succesfull insert the new file into the media library (create a new attachment post type).
  $wp_filetype = wp_check_filetype($filename, null );

  $attachment = array(
    'post_mime_type' => $wp_filetype['type'],
	'post_parent'    => $post_id,
	'post_title'     => preg_replace( '/\.[^.]+$/', '', $filename ),
	'post_content'   => '',
	'post_status'    => 'inherit'
  );

  $attachment_id = wp_insert_attachment( $attachment, $upload_file['file'], $post_id );

  if ( ! is_wp_error( $attachment_id ) ) {
     // if attachment post was successfully created, insert it as a thumbnail to the post $post_id.
     require_once(ABSPATH . "wp-admin" . '/includes/image.php');

     $attachment_data = wp_generate_attachment_metadata( $attachment_id, $upload_file['file'] );

     wp_update_attachment_metadata( $attachment_id,  $attachment_data );
     set_post_thumbnail( $post_id, $attachment_id );
   }
}

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