Languages of programming PHP Can some one help please!

Question

What output results from the following code?
<?php
$num = 18;
$num--;
echo $num;
?>

Answer 1

<?php
$num = 18;
//assignmed 18 to num
$num--;
//postdecrement
echo $num;
//print number after decrement
?>
output of this code is 17 because due to post increment property in first step value store in num then in next step if num is again come then it use the deferment by 1 value of num and print it so the output is 17

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