Adding post thumbnail in programatically inserted post

3 comments

1. The post thumbnail is just saved as post meta with the key: _thumbnail_id. So after you insert the post and get the post id, you can set the post meta for that post. The $thumbnail_id is just the ID of the image you’d like to set as the thumbnail, up to you since I can’t tell from your question what this should be.

   global $user_ID;
   $new_post = array(
       'post_title' => 'My New Post',
       'post_content' => 'Lorem ipsum dolor sit amet...',
       'post_status' => 'publish',
       'post_date' => date('Y-m-d H:i:s'),
       'post_author' => $user_ID,
       'post_type' => 'post',
       'post_category' => array(0)
   );
   $post_id = wp_insert_post($new_post);
   
   if( ! is_wp_error( $post_id ) )
          update_post_meta( $post_id, '_thumbnail_id', $thumbnail_id );
   

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2. use the function set_post_thumbnail,

   //$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($file));
   if(!$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'
     );
     //wp_insert_attachment( $attachment, $filename, $parent_post_id );
     $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');
        //wp_generate_attachment_metadata( $attachment_id, $file ); for images
        $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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3.  $wp_filetype = wp_check_filetype(basename($filename), null );
     $wp_upload_dir = wp_upload_dir();
     $attachment = array(
        'guid' => $wp_upload_dir['url'] . '/' . basename( $filename ), 
        'post_mime_type' => $wp_filetype['type'],
        'post_title' => preg_replace('/.[^.]+$/', '', basename($filename)),
        'post_content' => '',
        'post_status' => 'inherit'
     );
     $attach_id = wp_insert_attachment( $attachment, $filename, $post_id );     
     require_once(ABSPATH . 'wp-admin/includes/image.php');
     $attach_data = wp_generate_attachment_metadata( $attach_id, $filename );
     wp_update_attachment_metadata( $attach_id, $attach_data );
   

   For more information see this link
   https://developer.wordpress.org/reference/functions/wp_insert_attachment/

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