3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = ['0' => 1, '1' => 2, '2' => 3]; $b = ['0' => 4, '1' => 5, '2' => 6]; $result = []; foreach ($a as $k => $v) { $result[] = ['a' => $v, 'b' => $b[$k]]; } var_export($result);

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26.66 ms | 404 KiB | 5 Q