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<?php $nullvar = array( 0 => array('a' => 1), 1 => array('b' => 1) ); $nullvar[0]['a'] = null; if (isset($nullvar[0]['a'])) { echo "set"; } else { echo "not set"; } if (is_null($nullvar[0]['a'])) { echo "\nnull"; } else { echo "\nnot null"; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
not set null