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<?php $result = []; foreach ([0, '', null, false, ' ', '0', .0] as $v) { $k = match(true) { $v != null => '!= null', $v == null => '== null', // This should never occur. default => '?', }; $result[$k][] = $v; } var_export($result);
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.14, 8.4.1
array ( '== null' => array ( 0 => 0, 1 => '', 2 => NULL, 3 => false, 4 => 0.0, ), '!= null' => array ( 0 => ' ', 1 => '0', ), )
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