PHP7 Type Hinting with Casting - see https://gist.github.com/deshack/e63358a8726b7c3e0ba13563e4f9864c for a full collection of examples about PHP5/PHP7 type hinting

php7-type-hinting-casting.php

<?php

function setBool(bool $bool) {
  var_dump($bool);
}

setBool(true); // bool(true)

setBool('foo'); // bool(true)
setBool(''); // bool(false)

setBool(1); // bool(true)
setBool(-1); // bool(true)
setBool(0); // bool(false)

setBool([]);
// PHP Warning:  Uncaught TypeError: Argument 1 passed to setBool() must be of the type boolean, array given

function setInt(int $number) {
  var_dump($number);
}

setInt(10); // int(10)
setInt('10'); // int(10)

setInt('foo');
// PHP Warning:  Uncaught TypeError: Argument 1 passed to setInt() must be of the type integer, string given