如何在wordpress中获取元描述值

I want meta description of currently executing page in the header.php file in wordpress.

Wordpress function "get_post_meta" is not useful for this. It only returns custom meta tags.

can anyone help me out.

I'm going out on a limb and assuming that you're generating meta description tags dynamically. If that's the case, this should get you what you need...

<?php
    echo get_post_meta($post->ID, 'description', true);
?>

If, on the other hand, that's not what you're doing... that method will not work.