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1. leeyha
   Member
   Posted 2 years ago #

   Hi, I was able to allow the user to select from 2 categories and wordpress would display all the posts matching these categories. Only the posts in both categories are displayed.

   On the post page, I want to display the title of the two categories selected before the list of posts - some what like "Here are archives to XXX and YYY categories". I can display the 1st category title but not the second selected category title.

   The input string goes something like this http://website/?cat=3&cat=12. If a search string is supplied, it goes like this http://website/?cat=3&cat=12&s=searchtext

   Anyone please help.

2. leeyha
   Member
   Posted 2 years ago #

   Think I wasn't clear on the help required. The help question is: How can I display the title of the two categories selected on the post page?

3. Kafkaesqui
   Moderator
   Posted 2 years ago #

   I'm not sure the issue here is one of clarity rather than difficulty.

   First thing, as far as I know using:

   http://website/?cat=3&cat=12

   will not work. The second cat value overrides the first in your GET array. WordPress however will parse:

   http://website/?cat=3,12

   as a query for posts in categories 3 and 12. With that, to display the categories we can do something like:

   <?php
global $wp_query;
if( $wp_query->query_vars['cat'] ) :
$cats = explode(',', $wp_query->query_vars['cat']);
foreach ($cats as $catid) :
$category = get_the_category_by_id($catid);
echo $category . ' ';
endforeach;
endif;
?>

4. leeyha
   Member
   Posted 2 years ago #

   Hi, thanks for this. It comes close to what I wanted & found my solution from this hint you provide.

   Thanks Very Much & Merry Xmas.

   Here is my solution.

   The string that I am passing is actually:
   http://website/?s=&cat=3&cat=12

   Here is my code:
   $cats = explode('=', $_SERVER['QUERY_STRING']);
   echo $_SERVER['QUERY_STRING']. ' is server query | ';
   echo count($cats). ' is count | ';
   echo $cats[0]. ' is 0 | ';
   echo $cats[1]. ' is 1 | ';
   echo $cats[2]. ' is 2 | ';
   echo $cats[3]. ' is 3 | ';
   if (count($cats) > 2) :
   echo get_the_category_by_id($cats[2]). ' and '. get_the_category_by_id($cats[3]). ' categories.';
   else :
   echo get_the_category_by_id($cats[1]). ' category.';
   endif;
   ?>

   Here is my output:
   s=&cat=3&cat=12 is server query | 4 is count | s is 0 | &cat is 1 | 3&cat is 2 | 12 is 3 | All Learning Providers and All Locations categories.

   I know it is not 'neat' to pass a string like '3&cat' to get_the_category_by_id() function, but this this case, Wordpress is smart enough to pick up the cat_id. I am really pleasantly surprised by this.

   Thanks Again.

5. mastermind
   Member
   Posted 2 years ago #

   People, don't forget to sanitize your user input. Many of the functions you use are not designed to take input from "outside". At least you should run a mysql_real_escape_string() on the input variables before inserting them into any internal WordPress function. You don't want your WP database poisoned (and maybe welcome some new admin members), do you?

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