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<?php $allowed = ['Visa', 'Mastercard']; /** Make allowed all lowercase **/ $allowedLower = array_map(function($type) { return strtolower($type); }, $allowed); $cardsGiven = 'Visa,Mastercard,Mint'; $cardsAccepted = []; $data = explode(',', $cardsGiven); foreach ($data as $type) { if (in_array(strtolower($type), $allowedLower)) { $cardsAccepted[] = $type; } } print_r($cardsAccepted);
Output for 5.6.0 - 5.6.23, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Array ( [0] => Visa [1] => Mastercard )

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