Rendering a content of a page using tpl php
You can use the same template, add your custom content to a variable in template_preprocess_page function. 

function template_preprocess_page(&amp;$vars, $hook) {
  $path = current_path();
  if ($path == 'url') {
    $vars['custom_content'] = "your custom content";
    $vars['theme_hook_suggestions'][] = 'page__url';
  }
}


Then print the variable after the content. 

&lt;?php print render($page['content']); ?&gt;
&lt;?php print render($custom_content); ?&gt;