WordPress is child to selected page

This snippet of code is very useful when creating sub navigation in WordPress.
It allows you to check if a page is a child of a specific page.

Add this to your themes functions.php

 * Check to see if page is a child
 * @param  int  $id id of parent
 * @return boolean
function is_child($page_id) { 
    global $post; 
    if( is_page() && ($post->post_parent == $page_id) ) {
       return true;
    } else { 
       return false; 

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