Yes, Some time we need to check post has password protected or not. While loop displays all posts from depending on post_type. If you assigned “posts” to post_type  it will display all posts from posts type

But sometimes we need to show a different message to password protected posts in a loop, for this we need to do some conditionality check the password protected post or not.

Conditional to test if post has password protection or not

Example code check posts have password protection or not

[php] if(!empty($post->post_password)){
// Set different message to password protection posts
} [/php]

$post is a WordPress object to get all post related information form $post. Here we are calling post_password to check password post or not, once you called the post_password it will check the database for current post has password