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@ 2015-09-16T01:10:06Z

<?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 git.master, git.master_jit, rfc.property-hooks: 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.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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