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<?php $a = [2.2, 1.1, 3.9]; $b = ["B", "C", "F"]; $new = []; foreach ($a as $index => $value) { $new[] = [ $b[$index], $value ]; } print_r($new);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
Array ( [0] => Array ( [0] => B [1] => 2.2 ) [1] => Array ( [0] => C [1] => 1.1 ) [2] => Array ( [0] => F [1] => 3.9 ) )

preferences:
116.52 ms | 1314 KiB | 4 Q