Custom_Image_Header::ajax_header_add() WordPress Method

	public function ajax_header_add() {
		check_ajax_referer( 'header-add', 'nonce' );

		if ( ! current_user_can( 'edit_theme_options' ) ) {
			wp_send_json_error();
		}

		$attachment_id = absint( $_POST['attachment_id'] );
		if ( $attachment_id < 1 ) {
			wp_send_json_error();
		}

		$key = '_wp_attachment_custom_header_last_used_' . get_stylesheet();
		update_post_meta( $attachment_id, $key, time() );
		update_post_meta( $attachment_id, '_wp_attachment_is_custom_header', get_stylesheet() );

		wp_send_json_success();
	}
Uses	Description
wp-includes/capabilities.php:current_user_can()	Returns whether the current user has the specified capability.
wp-includes/theme.php:get_stylesheet()	Retrieves name of the current stylesheet.
wp-includes/pluggable.php:check_ajax_referer()	Verifies the Ajax request to prevent processing requests external of the blog.
wp-includes/functions.php:wp_send_json_error()	Send a JSON response back to an Ajax request, indicating failure.
wp-includes/functions.php:absint()	Convert a value to non-negative integer.
wp-includes/functions.php:wp_send_json_success()	Send a JSON response back to an Ajax request, indicating success.
wp-includes/post.php:update_post_meta()	Updates a post meta field based on the given post ID.