Always use esc_url or esc_url_raw (database queries, redirects and HTTP requests) when sanitizing URLs:
https://codex.wordpress.org/Function_Reference/esc_url
https://codex.wordpress.org/Function_Reference/esc_url_raw
Always use esc_url or esc_url_raw (database queries, redirects and HTTP requests) when sanitizing URLs:
https://codex.wordpress.org/Function_Reference/esc_url
https://codex.wordpress.org/Function_Reference/esc_url_raw