do {...} while (false) example assuming WordPress/PHP

dowhilefalse-example.php

function some_function($value) {
    do {
        if ( some_condition ) {
           break;
        }
        if ( some_other_condition ) {
           break;
        }
        if ( some_further_condition ) {
           break;
        }
        if ( isset($return) ) {
           break;
        }
        ... common code ...
    } while (false);
    return apply_filters('some_filter', $value);
}