16.
Which of the below statements is equivalent to $add += $add ?

17.
Which statement will output $x on the screen?

18.
What will be the output of the following code?
<?php
function track() 
{
	static $count = 0;
	$count++;
	echo $count;
}
track();
track();
track();
?>

19.
What will be the output of the following PHP code?
<?php
$a = "clue";
$a .= "get";
echo "$a";
?>

20.
What will be the output of the following PHP code?
<?php
$a = 5;
$b = 5;
span class="sys-fun">echo ($a === $b);
?>