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<?php

/**
 * is_parent
 * 
 * @author JoseRobinson.com
 * @link https://gist.github.com/jrobinsonc/e6098d90453d58f31793
 * @param int $pid
 * @return bool
 */
function is_parent($pid)
{
    global $post;

    return (is_page() && ($post->post_parent == $pid || is_page($pid))); 
}