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<?php $names = ["barira, stefan", "cikka, maria", "luppo, martin ", "bill, sebastian"]; $result = preg_replace('/(\w+),\s+(\w+)/', '$2, $1', $names); print_r($result);
Output for 5.6.40, 7.1.25, 7.2.0 - 7.2.33, 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 - 8.3.25, 8.4.1 - 8.4.12
Array ( [0] => stefan, barira [1] => maria, cikka [2] => martin, luppo [3] => sebastian, bill )

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137.4 ms | 408 KiB | 5 Q