the_permalink filter-hook . WP 1.0

This filter is documented in wp-includes/link-template.php

Usage

add_filter( 'the_permalink', 'filter_function_name_3637', 10, 2 );
function filter_function_name_3637( $permalink, $post_id ){
	// filter...

	return $permalink;
}

$permalink

-

$post_id

-

Where the hook is called

wp_login_url( apply_filters( 'the_permalink', get_permalink( $post_id ), $post_id ) )

wp_logout_url( apply_filters( 'the_permalink', get_permalink( $post_id ), $post_id ) )

echo esc_url( apply_filters( 'the_permalink', get_permalink( $post ), $post ) );

Where in WP core the hook is used WordPress