Question

How do I include the page content of one or more page in another page?

ex. I have pageA, pageB and pageC and I want to include the contents of these pages in pageX

is there a wordpress function that loads the post of a specified page/post?
like show_post(“pageA”)??

Answer 1

There is not a show_post() function per se in WordPress core but it is extremely easy to write:

function show_post($path) {
  $post = get_page_by_path($path);
  $content = apply_filters('the_content', $post->post_content);
  echo $content;
}

Note that this would be called with the page’s path, i.e.:

<?php show_post('about');  // Shows the content of the "About" page. ?>
<?php show_post('products/widget1');  // Shows content of the "Products > Widget" page. ?>

Of course I probably wouldn’t name a function as generically as show_post() in case WordPress core adds a same-named function in the future. Your choice though.

Also, and no slight meant to @kevtrout because I know he is very good, consider posting your WordPress questions on StackOverflow’s sister site WordPress Answers in the future. There’s a much higher percentage of WordPress enthusiasts answering questions over there.