Duck typing in a switch statement

switch-duck.php

<?php

$value = 0;

switch ($value) {
    case 'hello':
        echo 'hello world!';
        break;

    case '1':
        echo 'one!';
        break;

    case '0':
        echo 'zero!';
        break;

    default:
        echo 'default!';
        break;
}