ternary-operator

This question already has an answer here: What are the PHP operators “?” and “:” called and what do they do? 9 answers $items = (isset($_POST['items'])) ? $_POST['items'] : array(); I don't understand the last snippet of this code " ? $_POST['items'] : array(); " What does that combination of code do exactly? I use it to take in a bunch of values from html text boxes and store it into a session array. But the problem is, if I attempt to resubmit the data in text boxes the new array session overwrites the old session array completely blank spaces and all. I only want to overwrite places in the

Possible Duplicate: What are the PHP operators “?” and “:” called and what do they do? From http://twitto.org/ <?PHP require __DIR__.'/c.php'; if (!is_callable($c = @$_GET['c'] ?: function() { echo 'Woah!'; })) throw new Exception('Error'); $c(); ?> Twitto uses several new features available as of PHP 5.3: The DIR constant The ?: operator Anonymous functions What does number 2 do with the ?: in PHP 5.3? Also, what do they mean by anonymous functions? Wasn't that something that has existed for a while? Ben James ?: is a form of the conditional operator which was previously available only as:

I'm trying to write a method which gets a double , verifies if the number has something after the dot and if it does—returns a double , if doesn't—returns an int . public class Solution { public static void main(String[] args) { double d = 3.000000000; System.out.println(convert1(d)); System.out.println(convert2(d)); } static Object convert1(double d) { if(d % 1 == 0) return (int) d; else return d; } static Object convert2(double d) { return ((d%1) == 0) ? ((int) (d)) : d; } } Output: 3 3.0 So, everything I want happens in method convert1() , but doesn't happen in method convert2() . It seems

I'm confused as to why this code won't compile: var result = $"{fieldName}{isDescending ? " desc" : string.Empty}"; If I split it up, it works fine: var desc = isDescending ? " desc" : string.Empty; var result = $"{fieldName}{desc}"; According to the documentation : The structure of an interpolated string is as follows: { <interpolationExpression>[,<alignment>][:<formatString>] } The problem is that the colon is used to denote formatting, like: Console.WriteLine($"The current hour is {hours:hh}") The solution is to wrap the conditional in parenthesis: var result = $"Descending {(isDescending ?