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Description: ------------ PHP don't recognize letters like "acuted R" (in fact any acutted letter distinct from [aeiouy]) as "letters". Reproduce code: --------------- <?php var_dump(ctype_alpha('???')); var_dump(ctype_alpha('ŕźś')); var_dump(preg_match('/[a-z]/iU', '???')); var_dump(preg_match('/[a-z]/iU', 'ŕźś')); ?> Expected result: ---------------- bool(true) bool(true) int(1) int(1) Actual result: -------------- bool(false) bool(false) int(0) int(0)