WordPress Snippet to set the minimum length for comments

oaf_wp_set_minimal_lengh_for_comments.php

<?php
/**
 * This WordPress / Woocommerce code snippet set the minimum length for comments.
 *
 * Author: Oscar Abad Folgueira
 * Author URI: http://www.oscarabadfolgueira.com
 *
 * You can copy this snippet and paste in your functions.php or you can build your own plugin
 *
 * Change the number of characters to your needs.
 */

add_filter( 'preprocess_comment', 'set_minimal_length_for_comments' );

function set_minimal_length_for_comments( $comment ) {
    $min_length = 15;

    if ( strlen( $comment['comment_content'] ) < $min_length ){
        wp_die( 'Los comentarios deben ser por lo menos de ' . $min_length . ' caracteres.' );
    }
    return $comment;
}