Validation of Value Objects

gistfile1.php

<?php

// With static validation, no object is created if not valid.
if (Locale::isValid($localeName)) {
    $locale = new Locale($localeName);
    doFancyStuffWith($locale);
}

// With explicit validation
$locale = new Locale($localeName);
if ($locale->isValid()) {
    doFancyStuffWith($locale);
}

// With implicit validation, constructor throws exception on invalid locale
$locale = new Locale($localeName);
doFancyStuffWith($locale);