What will be the output of the following PHP code? (reminder: . is concatenation operator)

<?php

In PHP, which function is used to keep the session but erase all session variables stored in the current session?

JavaScript does not have non-blocking I/O; Node.js does not have blocking I/O.

In PHP, an array element that its index is missing is  __________________.

What will be the output of the following PHP code?

<?php
define("GREETING", "PHP is a scripting language");
echo GREETING;
echo "<br>";
echo GREETING;
?>

In PHP, when is the body of an if statement executed?

What will be the output of the following PHP code?

<?php
$a = 10;
echo ++$a;
echo $a++;
echo $a;
echo ++$a;
?>

In PHP, the session_start() function must appear _________.

In PHP, which of the following are correct ways of creating an array? (marks will be deducted for wrong choices.)

What will be the output of the following PHP code?

<?php