<?php /** * a range(), or regex [a-zA-Z] could also be used * @param string $input * @return bool whether it is a letter or not */ function isLetter($letter) { if (!is_string($letter)) throw new InvalidArgumentException('the argument must be a letter, `'.$letter.'` was passed in'); $letters = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM"; return strpos($letters, $letter) !== false; } /** * @param string $input * if it is true, echo true * elseif false, echo false * else echo other */ function isLetterLineOut($input) { var_dump($input); $output (true === $input) ? "true" : (false === $input) ? "false" : "other"; echo $output . PHP_EOL; } isLetterLineOut(isLetter("N")); isLetterLineOut(isLetter("1")); isLetterLineOut(isLetter("j")); isLetterLineOut(isLetter("-"));
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