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<?php $data = [ "date" => 1554328800, "events" => [130, 131, 163], "tags" => [4, "1,3,4", "1,3"] ]; // 1. List the events per individual tag foreach($data["tags"] as $i => $val) { $vals = explode(",", $val); foreach($vals as $val) { $eventsByTag[$val][] = $data["events"][$i]; } } // 2. List the tags per set of events foreach($eventsByTag as $tag => $events) { sort($events, SORT_NUMERIC); $tagsByEvents[implode(",", $events)][] = $tag; } // 3. produce the result foreach($tagsByEvents as $events => $tags) { $events = explode(",", $events); if (count($tags) == 1) $tags = $tags[0]; $result[] = [ "date" => $data["date"], "events" => $events, "tags" => $tags ]; } print_r($result);
Output for git.master, git.master_jit, rfc.property-hooks
Array ( [0] => Array ( [date] => 1554328800 [events] => Array ( [0] => 130 [1] => 131 ) [tags] => 4 ) [1] => Array ( [date] => 1554328800 [events] => Array ( [0] => 131 [1] => 163 ) [tags] => Array ( [0] => 1 [1] => 3 ) ) )

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