How best to display notifications on the front-end using caught exceptions as an example

Question

I'm using exceptions in my plugin.

function foo() {
    // Some code.
    throw new Exception( 'Division by 0' );
    // Code continued.
}

try {
    echo foo();
} catch ( Exception $e ) {

}

I'm aware $e->getMessage() will give me the caught exception's message, but in the absence of a notifications API, what is the recommended way to display this message to the user on the front-end?

Answer 1

For admin area you can use admin_notices:

https://codex.wordpress.org/Plugin_API/Action_Reference/admin_notices

For public area (front end) you would probably need to output to some hook and insert the proper CSS. You could use wp_footer() for that, which is present in every theme (or at least should be) and is inside the body tag.