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How can I set WordPress featured image to a WordPress page programmatically

You can use wp_insert_attachment method to attach a WordPress Image as featured image

$post_id = 1;
$url = "http://www.domain.com/logo.jpg";
$http = new WP_Http();
$response = $http->request( $url );
$upload = wp_upload_bits( basename($url), null, $response['body'] );
$file_path = $upload['file'];
$file_name = basename( $file_path );
$file_type = wp_check_filetype( $file_name, null );
$attachment_title = sanitize_file_name( pathinfo( $file_name, PATHINFO_FILENAME ) );
$wp_upload_dir = wp_upload_dir();
$post_info = array(
'guid'=> $wp_upload_dir['url'] . '/' . $file_name, 
'post_mime_type'	=> $file_type['type'],
'post_title'		=> $attachment_title,
'post_content'		=> '',
'post_status'		=> 'inherit',
);
$attach_id = wp_insert_attachment( $post_info, $file_path, $post_id );
require_once( ABSPATH . 'wp-admin/includes/image.php' );
$attach_data = wp_generate_attachment_metadata( $attach_id, $file_path );
wp_update_attachment_metadata( $attach_id, $attach_data );