When you’ve sub pages or child pages with parent ID in WordPress, you may want to check for the parent page ID for your sub pages or child pages.
Instructions: Add the following code to the functions.php file of your WordPress theme to return ID if parent page exists.
function is_subpage() {
global $post;
if ( is_page() && $post->post_parent ) {
return $post->post_parent;
} else {
return false;
}
}
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