WordPress - Retrieve a Page if it's a direct descendant of another Page

Question

I have this piece of code that works great: it retrieves a particular page from my WordPress database so I can wrap custom code around it in a template. In the instance below it grabs the page called Showreel:

        <?php
        $page = get_page_by_title('Showreel');
        ?>          
        <?php
             $my_id = $page;
             $post_id = get_post($my_id, ARRAY_A);
             $title = $post_id['post_title'];
             $content = $post_id['post_content'];
        ?>
        <h3><?php echo $title;?></h3>                       
        <?php 
            echo $content
        ?>

However, I have conundrum - I have some pages that do not have unique names. How can I retrieve a page only if it is a direct descendant of a certain parent e.g. I would like to retrieve a page under Showreel called The Ruth Rendell Mysteries. My initial thought was that the code below would work, but it doesn't.

        <?php
        $page = get_page_by_title('Showreel->The Ruth Rendell Mysteries');
        ?>          

Answer 1

have a look at:

get_page_by_path()

codex.wordpress.org/Function_Reference/get_page_by_path

Answer 2

As you already discovered, the get_page_by_title function does not accept arguments in that fashion. However, if you look through the available functions at the Wordpress Docs site, you will find get_page_children():

http://codex.wordpress.org/Function_Reference/get_page_children

In the code examples, they retrieve the page object with the get_page_by_title function and then get all of the children of that page. From there, you could separate out the page you wanted.

To see other functions and how they are used take a few minutes to browse through the rest of the Function Reference for some good examples.

Hope this helps and good luck!