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<?php $array = [ '1,2,1,23,5,2', '1,1,1,2,3,2', '2,3,4', '1,2,3', '1,2,3,4', '1,2,3,10', '1,2,3,4', '1,2,3', '3,2,2' ]; var_export(explode(',', implode(',', $array)));
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 0 => '1', 1 => '2', 2 => '1', 3 => '23', 4 => '5', 5 => '2', 6 => '1', 7 => '1', 8 => '1', 9 => '2', 10 => '3', 11 => '2', 12 => '2', 13 => '3', 14 => '4', 15 => '1', 16 => '2', 17 => '3', 18 => '1', 19 => '2', 20 => '3', 21 => '4', 22 => '1', 23 => '2', 24 => '3', 25 => '10', 26 => '1', 27 => '2', 28 => '3', 29 => '4', 30 => '1', 31 => '2', 32 => '3', 33 => '3', 34 => '2', 35 => '2', )

preferences:
55.41 ms | 403 KiB | 62 Q