3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?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("-"));
based on CUbfJ
Output for 7.0.0 - 7.2.0
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 5.3.18 - 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.