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<?php use Carbon\Carbon; $coll = collect([ ['a' => 1, 'b' => 2, 'created_at' => '2021-01-01 10:10:10'], ['a' => 3, 'c' => 4, 'created_at' => '2021-01-01 11:10:10'], ['a' => 5, 'b' => 6, 'created_at' => '2021-01-01 10:53:22'], ['a' => 7, 'c' => 8, 'created_at' => '2021-01-01 12:39:41'], ]); var_export( $coll->groupBy( fn($row) => Carbon::parse($row['created_at'])->hour )->toArray() );
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