Online PHP editor | refs for XEiQb

<?php $x = NULL; if (is_null($x)) { echo "x is null\n"; } else { echo "x is not null\n"; } if (isset($x)) { echo "x is set\n"; } else { echo "x is not set\n"; } if (is_null($y)) { echo "y is null\n"; } else { echo "y is not null\n"; } if (isset($y)) { echo "y is set\n"; } else { echo "y is not set\n"; } if (compact('x') != array()) { echo "x has been set\n"; } else { echo "x has not been set\n"; } if (compact('y') != array()) { echo "y has been set\n"; } else { echo "y has not been set\n"; }