Plus Plus Minus Minus
<?php
$d = 0;
echo $d + + - - 1;
?>
What does a separated list of plus and minus do to a literal? They will be merged independently in the literal. Here, two negations will make a positive, so we get a plus.
Don’t forget the space between the plus and minus, or it will be a post increment operator, and a different answer.
See Also
- plus plus [Try me]
PHP Features
Last updated: 10 September 2026