This function is used to include "snippets" in Wolf pages. The syntax is:

<?php $this->includeSnippet('the_name_of_the_snippet'); ?>

On the way the special PHP variable $this-> behaves when used in a snippet, see the documentation for $this->.

Snippets may call/include other snippets.

From 0.7.0:¹⁾ the includeSnippet() function will return “true” if the snippet name is found, but “false” if the snippet name does not exist. If a test is used which evaluates includeSnippet() as “true”, the value of the snippet will be passed automatically.

You could also create a snippet with your php code, then only include it on the relevant page by using a conditional statement. That way you won't need a page-part, and it's only a small addition to your layout:

<?php // only include on contact page or children
if(url_start_with('/contact'))  $this->includeSnippet('the_name_of_the_snippet'); ?>

Just keep in mind that it will also be included in any children pages, because it's looking for a url that begins with the provided text.

HT: mrgoatee