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<?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"; }
Output for git.master, git.master_jit, rfc.property-hooks
x is null x is not set Warning: Undefined variable $y in /in/U8jpj on line 7 y is null y is not set

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