February 11, 2011 
Definition:
function author_can( $post, $capability ) {}
Whether author of supplied post has capability or role.
Parameters
- int|object $post: Post ID or post object.
- string $capability: Capability or role name.
Source code
function author_can( $post, $capability ) {
if ( !$post = get_post($post) )
return false;
$author = new WP_User( $post->post_author );
if ( empty( $author->ID ) )
return false;
$args = array_slice( func_get_args(), 2 );
$args = array_merge( array( $capability ), $args );
return call_user_func_array( array( &$author, 'has_cap' ), $args );
}
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A HitchHackers guide through WordPress 
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