How can you understand this piece of code?

Question

WordPress

Hello, how can I understand this piece of code?

$attributes['redirect'] = '';
    if ( isset( $_REQUEST['redirect_to'] ) ) {
        $attributes['redirect'] = wp_validate_redirect( $_REQUEST['redirect_to'], $attributes['redirect'] );
    }

Provided that $attributes are shortcode attributes.
It seems like I read about wp_validate_redirect on the Internet, but all the information was only in English and I did not achieve a clear understanding. Therefore, please explain this code, including the above function and the IF condition.
Thanks in advance!

Answer 1

Well, I already explained.
Checks if the redirect_to parameter is present in the response , if it is, it checks if it is in the list of allowed ones and returns it, if not, then returns the value set in $attributes['redirect']
More answered your question on the site. wp-panda.com/build-a-custom-wordpress-user-flow-pa...

Answer 2

If just checks if the variable exists
And about the function, just go and look at its code, everything is open there