Pre-increment¶
Pre-increment is the ++ operator, used on a variable, when it is placed before the variable. This means that the increment happens before the variable is read: in this case, the first echo displays 2, as the increment happens before the echo call.
There is also a pre-decrement, which uses the operator --, and reduces the variable of 1.
Pre-increment and pre-decrement have a corresponding post-increment and post-decrement.
<?php
$a = 1;
echo ++$a; // displays 2
echo $a; // displays 2
?>
See also Understanding the Increment and decrement operators in PHP and Useless post increment/decrementPHP-W1090.
Related : Post-increment, Variables, Increment, Double, Minus -
