Filters the display of the permalink for the current post.
the_permalink is a filter applied to the permalink URL for a post prior to printing by the function the_permalink().
Note: The output of the functions get_permalink() or get_the_permalink() is not filtered.
echo esc_url( apply_filters( 'the_permalink', get_permalink( $post ), $post ) );
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https://developer.wordpress.org/reference/hooks/the_permalink