How to get posts from many categories using WP_Query

Below is the code for getting posts from multiple categories using WP_Query

Just correct the cat value, it is used without an array. Check out Codex: WP_Query – Category Parameters link for more information. 

WP_Query( array(
  'posts_per_page' => 7,
  'cat' => '5,3,7',
) );

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