Why does the post_type_link hook everything twice?
I’ve added a WordPress hook:
add_filter('post_type_link', 'custom_post_type_link_venue', 11, 3);
Everything in that hook prints twice. I’ve simplified it to its minimum.
function custom_post_type_link_venue ($urlsub2, $post) {
if ($post->post_type == 'product') {
echo "test";
}
}
When I fire that function, "test" is shown twice.
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