Golf

Code golf is about creating the shortest code, in bytes, to solve a given problem, in a specific language or free of choice.

<?php

// All spaces are removed to make the code compact
$billionPlusOne=1+1e9;

// 1e9 is cast automatically to 1000000000 or 1_000_000_000, but takes less space to write

?>

See also Tips and Tricks when Golfing in PHP.

Related : Cast Operator, One Liner