<?php var_dump(check('a', 'A')); var_dump(check('b', 'B')); var_dump(check('b', 'A')); var_dump(check('C', 'A')); var_dump(check('a', 'a')); function check($a, $b) { return strtoupper($b) === $a || $b === strtoupper($a); }
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