How do I add a Featured Image programatically, given the URL/filename of the image, and Post ID associated with it?
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Is the image in the media library? Or do you only have a URL?– Jacob PeattieCommented Sep 18, 2018 at 14:53
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It's not in the media library, I have a local copy inside my theme folder.– PimCommented Sep 18, 2018 at 15:01
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Why the theme folder? Are you trying to set a default placeholder image?– Jacob PeattieCommented Sep 18, 2018 at 16:13
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Pls. use Google and refer to the Codex: codex.wordpress.org/Function_Reference/wp_insert_attachment– HansCommented Sep 18, 2018 at 16:18
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You have a set of images. And you have a set of posts. You want those images to be added as featured image of its respective post? Automatically?– Marcelo Henriques CortezCommented Sep 18, 2018 at 17:17
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1 Answer
For each image/post combination, run the following. $image_name is the filename, $post_id is the post ID.
if( $image_name != '' && !has_post_thumbnail( $post_id ) ){
$base = get_stylesheet_directory();
$imgfile= $base . '/import/' . $image_name; // Images are stored inside an imports folder, in the theme directory
$filename = basename($imgfile);
$upload_file = wp_upload_bits($filename, null, file_get_contents($imgfile));
if (!$upload_file['error']) {
$wp_filetype = wp_check_filetype($filename, null );
$attachment = array(
'post_mime_type' => $wp_filetype['type'],
'post_parent' => 0,
'post_title' => preg_replace('/\.[^.]+$/', '', $filename),
'post_content' => '',
'post_status' => 'inherit'
);
$attachment_id = wp_insert_attachment( $attachment, $upload_file['file'], $post_id );
if (!is_wp_error($attachment_id)) {
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 );
}
}
If handling a lot of images/posts, you might run into a PHP timeout. If so, simply run the function again. There is a check for images that have already been attached so this shouldn't be a problem.