wp_get_attachment_thumb_url

wp_get_attachment_thumb_url: 这个函数检索附件的缩略图的URL。它接受附件ID作为参数，并返回缩略图的URL。

检索附件缩略图的URL。

function wp_get_attachment_thumb_url( $post_id = 0 ) {
	$post_id = (int) $post_id;

	// This uses image_downsize() which also looks for the (very) old format $image_meta['thumb']
	// when the newer format $image_meta['sizes']['thumbnail'] doesn't exist.
	$thumbnail_url = wp_get_attachment_image_url( $post_id, 'thumbnail' );

	if ( empty( $thumbnail_url ) ) {
		return false;
	}

	/**
	 * Filters the attachment thumbnail URL.
	 *
	 * @since 2.1.0
	 *
	 * @param string $thumbnail_url URL for the attachment thumbnail.
	 * @param int    $post_id       Attachment ID.
	 */
	return apply_filters( 'wp_get_attachment_thumb_url', $thumbnail_url, $post_id );
}