post-increment-vs-pre-increment.md

Post increment vs pre increment

<?php
$i = 10;
$a = $i++;
// Now $a is 10, and $i is 11

$i = 10;
$a = ++$i;
// Now $a is 11, and $i is 11

# There is sometimes a slight preformance cost for using $i++. See, when you do something like
$a = $i++; 

# You're really doing this:
$temporary_variable = $i;
$i = $i+1;
$a = $temporary_variable;