Script which insert comments to a random post of wordpress - by using the core wordpress comments

wp-add-comment.php

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;
wp_reset_postdata();

$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

$randIP = "".mt_rand(0,255).".".mt_rand(0,255).".".mt_rand(0,255).".".mt_rand(0,255); //random ip

//one comment
$comentario_aleatorio = $comentarios[array_rand($comentarios)]; //get a random value of the comments array
$nombre_aleatorio = $nombres[array_rand($nombres)]; //get a random value of the names array

//insert in the table
$time = current_time('mysql');
$data = array(
    'comment_post_ID' => $mypost_id,
    'comment_author' => $nombre_aleatorio,
    'comment_author_email' => 'admin@admin.com',
    'comment_author_url' => 'http://',
    'comment_content' => $comentario_aleatorio,
    'comment_type' => '',
    'comment_parent' => 0,
    'user_id' => 0,
    'comment_author_IP' => $randIP,
    'comment_agent' => 'Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.0.10) Gecko/2009042316 Firefox/3.0.10 (.NET CLR 3.5.30729)',
    'comment_date' => $time,
    'comment_approved' => 1,
);
wp_insert_comment( $data );
}