redirect single.php if post is not in a category

  • I’m trying to get my single.php page to redirect to the home page if the post displayed is not in a particular category (id=19). I’ve read various things that almost do this, but I cant seem to get it to work, any help much appreciated.

    I’ve tried modifying this:

    <?php
$category = get_the_category();
$category_id = $category[0]->cat_ID;
$relocate = get_category_link($category_id);
header("Location:".$relocate);
?>

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