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How to count how many categories a post have in Wordpress?

If a post has "Banana", "Orange", and "Kiwi" as categories, how can I know that the total number of categories in this post are 3?

Thank you.

Solution

  • You can use the function get_the_category within your post loop : 

    <?php
$post = get_post();
if ( $post ) {
    $categories = get_the_category( $post->ID );
    var_dump( $categories );
}

    then $categories will contain all your categories related to this post. You only have to use count($categories) to get the number.