<html><body>$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><!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_func_var_unset by HTTrack Website Copier/3.x [XR&CO'2014], Mon, 27 Jan 2020 02:51:08 GMT --></html>