在PHP中过滤类别（两个或更多）中的常见值

We have created various categories using WordPress CMS. We have to filter the data by clicking categories. I need to filter the category values (data) when I click more than two category. I have used array_intersect concepts for picking common values among categories. But It's working for two categories alone.

When I click (which is a select option) more than two categories, it didn't work. Please help me to find the solution.

Try this, it should work (but untested for now):

<?php

$args = array(
  'post_type' => 'post',
  'cat' => '33,45,56'
)

$query = new WP_Query( $args );

if( $query->have_posts() ) {

  while( $query->have_posts() ): $query->the_post();
    /* do stuff here */
  endwhile;
  wp_reset_postdata();

}

?>

Check the WP Query Codex (Category Parameters) for more information