This throws a fatal error at line 242. How can I fix it? (Wordpress 6. PHP 8.1)
Fatal error: Uncaught Error: Undefined constant "WikiLinksPlugin" in /home/wp_tuxz2-40o/example.com/wp-content/plugins/wiki-page-links/wikipagelinks.php:242 Stack trace: #0 /home/wp_tuxz2-40o/example.com/wp-admin/includes/plugin.php(2314): include_once() #1 /home/wp_tuxz2-40o/example.com/wp-admin/plugins.php(192): plugin_sandbox_scrape('wiki-page-links...') #2 {main} thrown in /home/wp_tuxz2-40o/example.com/wp-content/plugins/wiki-page-links/wikipagelinks.php on line 242
<?php
/*
Plugin Name: Wiki Page Links
Plugin URI: http://www.flyingsquirrel.ca/
Description: Automatically links to pages, wiki-style.
Author: Darcy Casselman
Version: 0.4
Author URI: http://www.flyingsquirrel.ca/
Darcy Casselman
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
require_once ABSPATH . WPINC . "/post.php";
if ( !class_exists("WikiLinksPlugin") ) {
class WikiLinksPlugin {
var $name = "WikiPageLinksPlugin";
var $shortName = "WikiPageLinks";
var $longName = "Wiki Page Links Plugin";
var $adminOptionsName = "WikiPageLinksPluginAdminOptions";
var $debug = false;
var $defaultShortcuts = array(
'wiki' => 'http://en.wikipedia.org/wiki/%s',
);
function log($message) {
if ($this->debug)
error_log($message . "\n", 3, "/tmp/wikilinks.log");
}
//PHP4 constructor
function WikiLinksPlugin() {$this->__construct();}
//PHP5 constructor
function __construct() {
// WordPress Hooks
//add_action('admin_menu', array(&$this, 'addAdminPanel'));
add_filter('the_content', array(&$this, 'wiki_filter'));
}
function _install() {
$this->log("Wiki Links installed!");
}
function _uninstall() {
$this->log("Wiki Links uninstalled!");
}
/**
* Added by Daniel Llewellyn (Fremen):
* separate out the viewed title from the link name from wikilinks of the form [[link|some user title]]
*/
function wiki_get_piped_title($link) {
list($link, $title) = explode('\|', $link, 2);
if (!$title) $title = $link;
return array($link, $title);
}
/* The filter.
* Replaces double brackets with links to pages.
*/
function wiki_filter($content) {
$options = $this->getAdminOptions();
//Match only phrases in double brackets. A backslash can be
//used to escape the sequence, if you want literal double brackets.
preg_match_all('/\[\[([^\]]+)\]\]/', $content, $matches);
//$matches[1] is an array of all the phrases in double brackets.
//Dumping all the matches into a hash ensures we only look up
//each matching page name once.
$links = array();
foreach( $matches[1] as $keyword ) {
$links[$keyword] = current($matches[0]);
next($matches[0]);
}
foreach( $links as $full_link => $match ) {
// If the "page title" contains a ':', it *may* be a shortcut
// link rather than a page. Deal with those first.
list($prefix, $sublink) = explode(':', $full_link, 2);
if ( $sublink ) {
if ( array_key_exists($prefix, $options['shortcuts']) ) {
list($link, $subtitle) = $this->wiki_get_piped_title($sublink);
$shortcutLink = sprintf( $options['shortcuts'][$prefix],
rawurlencode($link));
$content = str_replace($match,
"<a href='$shortcutLink'>$subtitle</a>",
$content);
continue;
}
}
list($link, $page_title) = $this->wiki_get_piped_title($full_link);
//We have a page link.
//TODO: cut down on db hits and get the list of pages instead.
if ( $page = get_page_by_title(html_entity_decode($link, ENT_QUOTES)) ) {
$content = str_replace($match,
"<a href='". get_permalink($page->ID) ."'>$page_title</a>",
$content);
} else if ( is_user_logged_in() ) {
//Add a link to create the page if it doesn't exist.
//TODO: limit showing the link to users who can create posts.
$home = get_option('siteurl');
$encodedlink = urlencode($link);
$content = str_replace($match, "{$page_title}[<a href='$home/wp-admin/post-new.php?post_type=page&post_title=$encodedlink' class='nonexistant_page' title='Create this page (requires a valid \"contributer\" account)'>?</a>]", $content);
} else {
$content = str_replace($match, $page_title, $content);
}
}
return $content;
}
function getAdminOptions() {
//defaults
$options = array(
'shortcuts' => $this->defaultShortcuts,
);
$savedOptions = get_option($this->adminOptionsName);
if (!empty($savedOptions)) {
foreach ($savedOptions as $key => $value) {
$options[$key] = $value;
}
}
return $options;
}
function saveAdminOptions($options) {
if (get_option($this->adminOptionsName)) {
$this->log("Updating option: " . $this->adminOptionsName);
update_option($this->adminOptionsName, $options);
} else {
$this->log("Adding new option: " . $this->adminOptionsName);
add_option($this->adminOptionsName, $options);
}
}
function adminPanel() {
$adminOptions = $this->getAdminOptions();
$submitButton = "submit_Save${shortname}Options";
if (isset($_POST[$submitButton])) {
for ( $i=0; $i < $this->shortcutCount; $i++ ) {
if (isset($_POST["shortcut$i"])) {
$adminOptions['feeds'][$i] = $_POST["feeds$i"];
}
}
print_r($adminOptions);
$this->saveAdminOptions($adminOptions);
?>
<div class="updated"><p><strong>
<?php _e("Settings Updated", $this->name); ?>
</strong></p></div>
<?php
}
?>
<div class="wrap">
<h2><?php echo $longName; ?></h2>
<form method="post" action="<?php echo $_SERVER['REQUEST_URI']; ?>">
<?php wp_nonce_field('update-options'); ?>
<table class="form-table">
<tr valign="top">
<th scope="row"></th>
<td>
<input type="text"
name="feeds<?php echo $i; ?>"
value="<?php echo $feed; ?>"
size="50" />
<br />
</td>
</tr>
</table>
<input type="hidden" name="action" value="update" />
<input type="hidden" name="page_options"
value="new_option_name,some_other_option,option_etc" />
<p class="submit">
<input type="submit"
name="<?php echo $submitButton; ?>"
value="<?php _e('Save Changes'); ?>" />
</p>
</form>
</div>
<?php
}
function addAdminPanel()
{
add_submenu_page('options-general.php',
$this->longName,
$this->shortName,
10, __FILE__,
array(&$this, 'adminPanel'));
}
}
}
if (class_exists(WikiLinksPlugin) && !isset($wikiLinks_plugin)) {
$wikiLinks_plugin = new WikiLinksPlugin();
}
?>
class_existsvalue should be inside quotes.