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<?php function formatPhoneNumber(string $phonenumber) { $phonenumber = str_replace([' ', '-', '.', '(', ')'], '', $phonenumber); if (strpos($phonenumber, '+') === 0) { return $phonenumber; } if (strlen($phonenumber) === 10 && strpos($phonenumber, '06') === 0) { return '+31' . ltrim($phonenumber, '0'); } return $phonenumber; } echo formatPhoneNumber('0031 (0) 6 123 45 678');

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