garciasanchezdani

function addComment(){

global $wpdb;

//get a random post
$args=array('post_type'=>'post', 'orderby'=>'rand', 'posts_per_page'=>'1');
$mypost=new WP_Query($args);
while ($mypost->have_posts()) : $mypost->the_post();
    $mypost_id = $post->ID;
endwhile;

garciasanchezdani

function addComment(){

global $wpdb;

$slug = 'YOUR_SLUG';  //the slug of your post where you want to insert comments

$post_id = $wpdb->get_var("SELECT ID FROM $wpdb->posts WHERE post_name = '$slug'"); //retrieve id of the post

$comentarios = array(); //custom array of comments to insert...please fill in with your values
$nombres = array(); //custom array of names to insert...please fill in with your values