Assertions are a way of breaking out of code when there is an error or an unexpected input.

Some languages throw exceptions and some treat it as a break point.



Task

Show an assertion in your language by asserting that an integer variable is equal to 42.




<?php
$a = 5
#...input or change $a here
assert($a == 42) # when $a is not 42, take appropriate actions,
                 # which is set by assert_options()
?>