The first step is to paste the following code in your function.php file:
function digwp_includeContentShortcode($atts) {
$thepostid = intval($atts[postidparam]);
$output = '';
query_posts("p=$thepostid&post_type=page");
if (have_posts()) : while (have_posts()) : the_post();
$output .= get_the_content($post->ID);
endwhile; else:
// failed, output nothing
endif;
wp_reset_query();
return $output;
}
Once done, you can use the shortcode in your posts or pages, with the following syntax:
[digwp_include postidparam=XXXX]
postidparam is the ID of the post you want to include.
Credits goes to Chris Coyier for this awesome shortcode!
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WordPress hack: Use includes in your posts or pages