<?php $toSort = array( 1 => [ 'value' => 8000, 'key' => 1007 ], 2 => [ 'value' => 8001, 'key' => 1007 ], 3 => [ 'value' => 8002, 'key' => 1013 ], ); var_export( array_reduce( $toSort, function($result, $row) { $result[$row['key']][] = $row['value']; return $result; }, [] ) );
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