February 12, 2011 
Definition:
function post_password_required( $post = null ) {}
Whether post requires password and correct password has been provided.
Parameters
- int|object $post: An optional post. Global $post used if not provided.
Return values
returns:false if a password is not required or the correct password cookie is present, true otherwise.
Source code
function post_password_required( $post = null ) {
$post = get_post($post);
if ( empty($post->post_password) )
return false;
if ( !isset($_COOKIE['wp-postpass_' . COOKIEHASH]) )
return true;
if ( stripslashes( $_COOKIE['wp-postpass_' . COOKIEHASH] ) != $post->post_password )
return true;
return false;
}
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A HitchHackers guide through WordPress 
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