Limit comment length in WordPress by post ID

limit-comment-length-by-post-id.php

<?php
// Limit the comment length to 6000 characters and a minimum of 50 characters in WordPress for a specific post
add_filter('preprocess_comment', 'smartwp_limit_comment_length');

function smartwp_limit_comment_length($comment) {
    // Specify the post ID where you want this function to run
    $specific_post_id = 123; // Replace 123 with your desired post ID

    // Check if the current post is the specific post we want to target
    if (get_the_ID() == $specific_post_id) {
        // Limit the comments to 6000 characters
        if (strlen($comment['comment_content']) > 6000) {
            wp_die('Comment is too long. Comments must be under 6000 characters.');
        }

        // Require 50 characters to leave a comment
        if (strlen($comment['comment_content']) < 50) {
            wp_die('Comment is too short. Comments must be at least 50 characters.');
        }
    }

    return $comment;
}