<?php $data = [ 'dates' => ['2010-01-02', '2011-02-03', '2011-02-04'], 'type1' => ['data1', 'data2', 'data3'], 'type2' => ['data4', 'data5', 'data6'] ]; echo implode( "\n", array_merge( [implode(',', array_keys($data))], array_map( fn(...$col) => implode(',', $col), ...array_values($data) ) ) );
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