Get post ID outside of the loop

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here is a function that does just that:

function get_lastest_post_of_category($cat){
    $args = array( 'posts_per_page' => 1, 'order'=> 'DESC', 'orderby' => 'date', 'category__in' => (array)$cat);
    $post_is = get_posts( $args );
    return $post_is[0]->ID;
}

Usage: say my category id is 22 then:

$last_post_ID = get_lastest_post_of_category(22);

you can also pass an array of categories to this function.

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