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Question

Какой результат получается из следующего кода?
<? php
$ num = 18;
$ num--;
echo $ num;
?>

Answer 1

$num = 18;
$num--;
echo $num;

The result will be 17.
The post decrement operator will minus 1 from the $num variable and leave the value of 17.

It should also be noted that in other cases when using the post decrement, the original value of $num will be used and after it is used then 1 will be subtracted from it, as opposed to the pre decrement ( --$num) which will subtract 1 first and then use that value in calculations etc.