什么是将bool转换为文本值的最佳逻辑

Question

I find myself writing code very similar to this regularly, in PHP and in C#

print isset($required) ? ($required ? "required" : "not required") : "not required";

Feels like I should be able to do something like this

print falseornull($required) ? "not required" : "required"

I could write a function to do this for me in PHP or C#, but I'm wondering if something already exists in either language? In C# I know there's string.IsNullOrEmpty to check for blank strings. Any equivalents for other types?

Answer 1

Just as a code simplifier... If you're not checking for $required to be equal to a particular value, this:

print isset($required) ? ($required ? "required" : "not required") : "not required"; 

should be the same as this:

print empty($required) ? "not required" : "required";

empty() does just what you're after: "Determine whether a variable is considered to be empty. A variable is considered empty if it does not exist or if its value equals FALSE. empty() does not generate a warning if the variable does not exist. [...] The following things are considered to be empty:

"" (an empty string)"

http://us1.php.net/empty