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<!DOCTYPE html>
<html>
<body>
<?php
$a = "Hello world!";
echo "The value of variable 'a' before unset: " . $a . "<br>";
unset($a);
echo "The value of variable 'a' after unset: " . $a;
?>
</body>
</html>
The value of variable 'a' before unset: Hello world!
The value of variable 'a' after unset: