Thanks for your reply.
I was able to auto-answer my own question:
After researching, I found that the problem comes from the $_REQUEST[$param] instructions (there are 2 of them)..
When there is no query string on the URL, trying to use $_REQUEST[$param] generates an “Undefined index:” warning.
In order to avoid this, you need to check if $_REQUEST is set before to use it by doing:
if(isset($_REQUEST[$param])){
}
I updated the code of the plugin accordingly and no more warnings.
I copy and paste it below hoping the code will survive the editor formatting.
Simply edit the plugin form WordPress and copy paste this code in replacement of the existing code.
I suggest the author of the plugin to validate this update and to make a new version.
<?php
/*
Plugin Name: URL Params
Plugin URI: https://asandia.com/wordpress-plugins/urlparams/
Description: Short Code to grab any URL Parameter
Version: 2.1
Author: Jeremy B. Shapiro
Author URI: https://www.asandia.com/
----------------------------------------------------------------------
Updated by chrisK200 on July 4 2017 (search chrisK200 comments in the code) to avoid Undefined index notices.
See this trhead in the support forum:
https://www.ads-software.com/support/topic/php-notice-undefined-index-group/
----------------------------------------------------------------------
*/
/*
URL Params (WordPress Plugin)
Copyright (C) 2011-2016 Jeremy Shapiro
*/
//tell wordpress to register the shortcodes
add_shortcode("urlparam", "urlparam");
add_shortcode("ifurlparam", "ifurlparam");
function urlparam($atts, $content) {
$defaults = array(
'param' => '',
'default' => '',
'dateformat' => '',
'attr' => '',
'htmltag' => false,
);
# we used to use shortcode_atts(), but that would nuke an extra attributes that we don't know about but want. array_merge() keeps them all.
$atts = array_merge($defaults, $atts);
$params = preg_split('/\,\s*/',$atts['param']);
$return = false;
foreach($params as $param)
{
// chrisK200 -------------------
if(isset($_REQUEST[$param])){
// chrisK200 -------------------
if(!$return and ($rawtext = $_REQUEST[$param]))
{
if(($atts['dateformat'] != '') && strtotime($rawtext))
{
$return = date($atts['dateformat'], strtotime($rawtext));
} else {
$return = esc_html($rawtext);
}
}
// chrisK200
}
// chrisK200
}
if(!$return) {
$return = $atts['default'];
}
if($atts['attr']) {
$return = ' ' . $atts['attr'] . '="' . $return . '" ';
if($atts['htmltag']) {
$tagname = $atts['htmltag'];
foreach(array_keys($defaults) as $key) {
unset($atts[$key]);
}
$otheratts = "";
foreach($atts as $key => $val) {
$otheratts .= " $key=\"$val\"";
}
$return = "<$tagname $otheratts $return".($content ? ">$content</$tagname>" : "/>");
}
}
return $return;
}
/*
* If 'param' is found and 'is' is set, compare the two and display the contact if they match
* If 'param' is found and 'is' isn't set, display the content between the tags
* If 'param' is not found and 'empty' is set, display the content between the tags
*
*/
function ifurlparam($atts, $content) {
$atts = shortcode_atts(array(
'param' => '',
'empty' => false,
'is' => false,
), $atts);
$params = preg_split('/\,\s*/',$atts['param']);
foreach($params as $param)
{
// chrisK200 -------------------
if(isset($_REQUEST[$param])){
// chrisK200 -------------------
if($_REQUEST[$param])
{
if($atts['empty'])
{
return '';
} elseif(!$atts['is'] or ($_REQUEST[$param] == $atts['is'])) {
return do_shortcode($content);
}
}
// chrisK200
}
// chrisK200
}
if ($atts['empty'])
{
return do_shortcode($content);
}
return '';
}
?>
