For the following code
<?php
$a=1; $b=$a++; var_dump($b);
$a=1; $b=$a+$a++; var_dump($b);
$a=1; $b=$a+$a+$a++; var_dump($b);
$a=1; $b=$a+$a+$a+$a++; var_dump($b);
$a=1; $b=$a+$a+$a+$a+$a++; var_dump($b);
I obtained this result:
int(1)
int(3)
int(3)
int(4)
int(5)
I expected 1,2,3,4,5 rather than 1,3,3,4,5. Why after $a=1; $b=$a+$a++;
we obtain $b=3
?
PHP 7.1.5-1+deb.sury.org~xenial+1 (cli) (built: May 11 2017 14:07:52) ( NTS )