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<?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; }
Output for git.master, git.master_jit, rfc.property-hooks
array(4) { [0]=> int(1) [1]=> int(6) [2]=> int(7) [3]=> int(8) }

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