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<!DOCTYPE html> <html> <body> <?php $a = 0; // True because $a is set if (isset($a)) { echo "Variable 'a' is set.<br>"; } $b = null; // False because $b is NULL if (isset($b)) { echo "Variable 'b' is set."; } ?> </body> <!-- Mirrored from www.w3schools.com/php/phptryit.asp?filename=tryphp_func_var_isset by HTTrack Website Copier/3.x [XR&CO'2014], Tue, 07 Jun 2022 20:30:04 GMT --> </html>
Variable 'a' is set.