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<?php $result = []; foreach ([NULL, TRUE, FALSE, 0, 1, 'none'] as $v) { $eq = ($v == 'none'); $neq = ($v != 'none'); if ($eq && !$neq) { $result['== "none"'][] = $v; } elseif (!$eq && $neq) { $result['!= "none"'][] = $v; } else { // Hope this never occurs. $result['???'][] = $v; } } var_export($result);
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
array ( '!= "none"' => array ( 0 => NULL, 1 => false, 2 => 0, 3 => 1, ), '== "none"' => array ( 0 => true, 1 => 'none', ), )
Output for 7.1.25 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33
array ( '!= "none"' => array ( 0 => NULL, 1 => false, 2 => 1, ), '== "none"' => array ( 0 => true, 1 => 0, 2 => 'none', ), )
preferences:
102.01 ms | 408 KiB | 5 Q