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<?php $arr = array( array('N', 'N', 'Y', 'Y', 'Y', 'Y'), array('N', 'N', 'Y', 'Y', 'N', 'Y'), array('N', 'N', 'Y', 'Y', 'N', 'Y'), array('Y', 'Y', 'Y', 'Y', 'Y', 'Y'), ); $new = array(); $count = count($arr[0]); for ($i = 0; $i < $count; $i++) { $new[] = implode(',', array_column($arr, $i)); } print_r($new);
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.27, 8.4.1 - 8.4.14
Array ( [0] => N,N,N,Y [1] => N,N,N,Y [2] => Y,Y,Y,Y [3] => Y,Y,Y,Y [4] => Y,N,N,Y [5] => Y,Y,Y,Y )

preferences:
201.79 ms | 408 KiB | 5 Q