Plus +
+ is a native PHP operator. It has three usages:
- The addition, as in mathematics, on numbers. This works on integers and floats.
- The merging of arrays. This merge sets the keys once, then omits the next values. This is distinct from
array_merge(). - The + sign in front of a number, to make it explicitly positive. This is optional, and may be repeated.
<?php
$a = 1 + 2; // 3
$b = [1, 2] + [3, 4, 5]; // [1,2, 5]
$c = +6; // 6
?>