<?php function toggleDigitAlpha ($val) { $lookup = range("A", "Z"); if (ctype_alpha((string)$val)) { $lookup = array_flip($lookup); } return strtr($val, $lookup); } $string = "ABYZ"; echo "$string\n"; $string = toggleDigitAlpha($string); echo "$string\n"; $string = toggleDigitAlpha($string); echo "$string\n"; $string = toggleDigitAlpha($string); echo "$string";
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