The is_preview() WordPress PHP function determines whether the query is for a post or page preview.
Usage
if (is_preview()) {
// Do something if it's a preview
}
Parameters
- None
More information
See WordPress Developer Resources: is_preview()
Important: is_preview() does NOT check if the user is logged in or if the user can even edit the post. Use current_user_can() for checking roles and capabilities. Any visitor can add ?preview=true, ?preview=1, or ?preview=not_false to the URL, and is_preview() will return true.
Examples
Prevent analytics code from loading on preview pages
If you don’t want to load your analytics code on preview pages, use the is_preview() function:
if (!is_preview()) {
// Include analytics code
}
Show a message on preview pages
Display a message to users when they are previewing a post or a page:
if (is_preview()) {
echo 'This is a preview. Your changes have not been published yet.';
}
Disable comments on preview pages
If you want to disable comments on preview pages, you can use is_preview() in your comments section:
if (!is_preview()) {
comments_template();
}
Customize content for preview pages
Modify the content displayed when users are previewing a post or a page:
$content = get_the_content();
if (is_preview()) {
$content .= '<p><em>This is a preview. Your changes have not been published yet.</em></p>';
}
echo $content;
Hide sidebar on preview pages
Hide the sidebar when users are previewing a post or a page:
if (!is_preview()) {
get_sidebar();
}