<?php $array = [ ['date' => '2017-08-22', 'AAA' => 1231], ['date' => '2017-08-21', 'AAA' => 1172], ['date' => '2017-08-20', 'AAA' => 1125], ['date' => '2017-08-21', 'BBB' => 251], ['date' => '2017-08-20', 'BBB' => 21773], ['date' => '2017-08-22', 'CCC' => 3750], ['date' => '2017-08-20', 'CCC' => 321750], ]; foreach ($array as $row) { $date = $row['date']; unset($row['date']); $result[$date] = array_merge($result[$date] ?? [], $row); } var_export($result);
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Value for `_results` contains invalid data `array`