Question

In the PHP function below, I want to exclude cat_ID=1

How can I do it?

function get_cats(){
    $post_cats= array();
    $categories = get_the_category();
    foreach($categories as $cat){
        array_push($post_cats, $cat->cat_ID);
    }
    return $post_cats;
}

get_the_category() returns an array of all the categories that the current post is assigned to

Answer 1

foreach($categories as $cat){  
    if ($cat->cat_ID == 1)
       continue;
    array_push($post_cats, $cat->cat_ID);
}