This function’s access is marked private. This means it is not intended for use by plugin or theme developers, only in other core functions. It is listed here for completeness.

_show_post_preview()

Filters the latest content for preview from the post autosave.

Source

File: wp-includes/revision.php 

function _show_post_preview() {
	if ( isset($_GET['preview_id']) && isset($_GET['preview_nonce']) ) {
		$id = (int) $_GET['preview_id'];

		if ( false === wp_verify_nonce( $_GET['preview_nonce'], 'post_preview_' . $id ) )
			wp_die( __('Sorry, you are not allowed to preview drafts.') );

		add_filter('the_preview', '_set_preview');
	}
}

Expand Source Code View on GitHub

Related

Uses

Uses
Uses Description
wp-includes/l10n.php: __()

Retrieve the translation of $text.
wp-includes/pluggable.php: wp_verify_nonce()

Verify that correct nonce was used with time limit.
wp-includes/plugin.php: add_filter()

Hook a function or method to a specific filter action.
wp-includes/functions.php: wp_die()

Kill ClassicPress execution and display HTML message with error message.

Changelog

Changelog
Version Description
WP-2.7.0 Introduced.