what's wrong with this code : 'category_name' => 'Cat1,Cat2', ));

Are you using the category slugs?

no their names !

Than that’s what you are doing wrong. You need to use the slugs.

ah that’s why … I will try now

thanks !

It still doesn’t work
Do I should to replace category_name bu category_slug ???

https://codex.www.ads-software.com/Class_Reference/WP_Query#Category_Parameters

afaik, ‘category_name’ only takes one category slug;

for more than one category, try to use category IDs with ‘cat’ or ‘category__in’

Thanks Mr Alchymyth

I haven’t posted this issued until I searched all the night about this problem …

I don’t rush to post here whenever I have some problem ….

I have arleady tried “cat_id” as : cat_id => ‘(5,6)’

I ve tried different options …

afaik, ‘category_name’ only takes one category slug

You can use $query = new WP_Query( 'category_name=staff,news' );.

I have arleady been using this code :

<?php
  $fPosts = new WP_Query( array(
'offset' => 1,
'posts_per_page' => 3,
'category_slug' => '(proverbs,jokes)',
'post__in' => get_option("sticky_posts"),
'ignore_sticky_posts' => 1,
 ));
   ?>

                 <?php if ( $fPosts->have_posts() ) : ?>
/* etc .... */

So can I replace “‘category_slug’ => ‘(proverbs,jokes)'” with : ‘category_name=staff,news’ …. ????

OK

I will try to use this …
‘category__in’ => array( 2, 6 )

may be it will work

<?php
  $fPosts = new WP_Query( array(
'offset' => 1,
'posts_per_page' => 3,
'category_name' => 'cat1,cat2',
'post__in' => get_option("sticky_posts"),
'ignore_sticky_posts' => 1,
 ));
   ?>

EDITED

cat1,cat2) or (cat1,cat2) ??

'category_name' => 'cat1,cat2',

It still doesn’t work my friend …

This has worked for me :
‘category__in’ => array( 10,14 ),

Add it to your information …

thanks a lot for your efforts !

Can I use this with just one category …
I wanna use ID numbers to avoid blank spaces in category names!