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run code in 200+ php & hhvm versions
Bugs & Features
<?php $muLevelIds = [1,6,7,8,9]; $subjectLevelIds = [1,6,7,8]; $occLevelIds = []; var_dump(array_union($muLevelIds, $subjectLevelIds, $occLevelIds)); function array_union($muLevelIds, $subjectLevelIds, $occLevelIds) { $allLevelIds = [1,6,7,8,9]; if (!empty($muLevelIds) && !empty($subjectLevelIds) && !empty($occLevelIds)) { $combined = array_intersect($allLevelIds, $muLevelIds, $subjectLevelIds, $occLevelIds); } elseif (empty($muLevelIds) && !empty($subjectLevelIds) && !empty($occLevelIds)) { $combined = array_intersect($allLevelIds, $subjectLevelIds, $occLevelIds); } elseif (!empty($muLevelIds) && empty($subjectLevelIds) && !empty($occLevelIds)) { $combined = array_intersect($allLevelIds, $muLevelIds, $occLevelIds); } elseif (!empty($muLevelIds) && !empty($subjectLevelIds) && empty($occLevelIds)) { $combined = array_intersect($allLevelIds, $muLevelIds, $subjectLevelIds); } elseif (!empty($muLevelIds) && empty($subjectLevelIds) && empty($occLevelIds)) { $combined = array_intersect($allLevelIds, $muLevelIds); } elseif (empty($muLevelIds) && !empty($subjectLevelIds) && empty($occLevelIds)) { $combined = array_intersect($allLevelIds, $subjectLevelIds); } elseif (empty($muLevelIds) && empty($subjectLevelIds) && !empty($occLevelIds)) { $combined = array_intersect($allLevelIds, $occLevelIds); } elseif (empty($muLevelIds) && empty($subjectLevelIds) && empty($occLevelIds)) { $combined = []; } return $combined; }
based on OZ7bM
Output for 5.4.0 - 7.2.0
array(4) { [0]=> int(1) [1]=> int(6) [2]=> int(7) [3]=> int(8) }
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/JrtDE on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '[' in /in/JrtDE on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/JrtDE on line 5
Process exited with code 255.