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<?php $convertQ = function ($str) { switch ($str) { case 0: return 'no'; case 'No': return 'no'; case 1: return 'yes'; case 'Yes': return 'yes'; case 'Unsure': return 'maybe'; default: throw new \InvalidArgumentException('Unaccounted for value for questionnaire field: ' . $str); } }; var_dump($convertQ(0)); // expect 'no' var_dump($convertQ('No')); // expect 'no' var_dump($convertQ(1)); // expect 'yes' var_dump($convertQ('Yes')); // expect 'yes' var_dump($convertQ('Unsure')); // expect 'maybe' var_dump($convertQ('a')); // expect thrown error

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