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<?php $insertData = [ [ 'test' => '1', 'test1' => '2', ], [ 'test' => '3', 'test1' => '4', ] ]; $values = []; foreach ($insertData as $row) { $values += $row; } var_dump( ($values), );
Output for 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
array(2) { ["test"]=> string(1) "1" ["test1"]=> string(1) "2" }

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