need a plugin that show notification by a certain function

I made a shortcodes im my wordpress site and it works prefectly

in my shortcode I need to write an any function that will work when a problem occur to notify the admins about the problem

Example about what I need in the short code function

if ($var1 == '') {
    functionname();
} else {
    $var2 = $var1;
}
return $var2;

this is only a simple example

I want the functionname(); to notify the admins about the problem

Thanx