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<?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("-"));
Output for 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
Fatal error: Unparenthesized `a ? b : c ? d : e` is not supported. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)` in /in/GhhgG on line 25
Process exited with code 255.
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28
Fatal error: Unparenthesized `a ? b : c ? d : e` is not supported. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)` in /in/GhhgG on line 24
Process exited with code 255.
Output for 7.4.0 - 7.4.33
Deprecated: Unparenthesized `a ? b : c ? d : e` is deprecated. Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)` in /in/GhhgG on line 24 bool(true) Notice: Undefined variable: output in /in/GhhgG on line 24 Fatal error: Uncaught Error: Function name must be a string in /in/GhhgG:24 Stack trace: #0 /in/GhhgG(38): isLetterLineOut(true) #1 {main} thrown in /in/GhhgG on line 24
Process exited with code 255.
Output for 7.3.32 - 7.3.33
bool(true) Fatal error: Uncaught Error: Function name must be a string in /in/GhhgG:24 Stack trace: #0 /in/GhhgG(38): isLetterLineOut(true) #1 {main} thrown in /in/GhhgG on line 24
Process exited with code 255.
Output for 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31
bool(true) Notice: Undefined variable: output in /in/GhhgG on line 24 Fatal error: Uncaught Error: Function name must be a string in /in/GhhgG:24 Stack trace: #0 /in/GhhgG(38): isLetterLineOut(true) #1 {main} thrown in /in/GhhgG on line 24
Process exited with code 255.
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35, 5.6.8 - 5.6.28
bool(true) Notice: Undefined variable: output in /in/GhhgG on line 25 Fatal error: Function name must be a string in /in/GhhgG on line 25
Process exited with code 255.
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