WordPress/wp-comments-post.php

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PHP
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<?php
require( dirname(__FILE__) . '/wp-config.php' );
$comment_post_ID = (int) $_POST['comment_post_ID'];
$post_status = $wpdb->get_var("SELECT comment_status FROM $wpdb->posts WHERE ID = '$comment_post_ID'");
if ( empty($post_status) ) {
do_action('comment_id_not_found', $comment_post_ID);
exit;
} elseif ( 'closed' == $post_status ) {
do_action('comment_closed', $comment_post_ID);
die( __('Sorry, comments are closed for this item.') );
}
$comment_author = $_POST['author'];
$comment_author_email = $_POST['email'];
$comment_author_url = $_POST['url'];
$comment_content = $_POST['comment'];
$comment_type = '';
$user_ip = apply_filters('pre_comment_user_ip', $_SERVER['REMOTE_ADDR']);
if ( get_settings('require_name_email') && ('' == $email || '' == $author) )
die( __('Error: please fill the required fields (name, email).') );
if ( '' == $comment_content )
die( __('Error: please type a comment.') );
$commentdata = compact('comment_post_ID', 'comment_author', 'comment_author_email', 'comment_author_url', 'comment_content', 'comment_type');
wp_new_comment($commentdata);
setcookie('comment_author_' . COOKIEHASH, stripslashes($author), time() + 30000000, COOKIEPATH);
setcookie('comment_author_email_' . COOKIEHASH, stripslashes($email), time() + 30000000, COOKIEPATH);
setcookie('comment_author_url_' . COOKIEHASH, stripslashes($url), time() + 30000000, COOKIEPATH);
header('Expires: Mon, 11 Jan 1984 05:00:00 GMT');
header('Last-Modified: ' . gmdate('D, d M Y H:i:s') . ' GMT');
header('Cache-Control: no-cache, must-revalidate, max-age=0');
header('Pragma: no-cache');
$location = get_permalink($comment_post_ID);
header("Location: $location");
?>