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<?php $a = NULL; if (!is_null($a)) { echo "The variable is set to NULL."; } else { echo "The if clause was not run"; } /* echo isset($a)?'true':'false'; */
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
The if clause was not run