<?php $array = [ '2018-03-12' => [ 'United States' => 4, 'Australia' => 15, 'United Kingdom' => 0, 'New Zealand' => 0, ], '2018-03-13' => [ 'United States' => 0, 'Australia' => 8, 'United Kingdom' => 2, 'New Zealand' => 0, ] ]; foreach ($array as $key => $subarray) { $result[] = array_merge([$key], array_values($subarray)); } var_export($result);
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Value for `_results` contains invalid data `array`