string $permalink, WP_Post $post, bool $leavename )
Filters the permalink for a post.
Only applies to posts with post_type of ‘post’.
The post's permalink.
The post in question.
Whether to keep the post name.
post_link is a filter applied to the permalink URL for a post prior to returning the processed url by the function get_permalink() .
This filter only applies to posts with post_type of ‘post’. For that filter which applies to custom post type look post_type_link.
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return apply_filters( 'post_link', $permalink, $post, $leavename );