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Conditional tag for subpages of a Page in WordPress for Genesis

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This tutorial provides the way to conditionally target a selected parent page and its subpages in WordPress. while working with Genesis Framework.

TYEP 1

WordPress offers is_tree() option to create a function and then output a small snippet based on Page ID.

function is_tree($pid) { // $pid = The ID of the page we're looking for pages underneath
	
	global $post; 
	        // load details about this page
	if(is_page()&&($post->post_parent==$pid||is_page($pid))) 
        return true;   // we're at the page or at a sub page
	else 
        return false;  // we're elsewhere
};

Usage:

add_action('genesis_before_content', 'custom_tree_child', 15);
function custom_tree_child'() {
	
	if ( is_tree(533) ) { 
    echo "This is a child page";
	}
}

Text -> This is a child page <- will output on subpages of a Parent Page with ID 533. You must change it to match with your Parent Page ID.

TYPE 2

This is a similar approach but works directly.

// if a page is a child of a certain page
add_action('genesis_before_content', 'custom_parent_child_pages', 15);
function custom_parent_child_pages() {
	global $post;
	if ( $post->post_parent == '533' ) { //is_page( 'about' ) || '2' == $post->post_parent )
    echo "This is a child page";
	}
}

Change Number to match with your Parent Page ID.

Reference:

https://codex.wordpress.org/Conditional_Tags
https://developer.wordpress.org/reference/functions/is_page/

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