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► KB ► To/From Guides ► PHP ► Language Details

Constants (Cross Ref > Language Details)

By Mike Prestwood

PHP versus C++/CLI: A side by side comparison between PHP and C++/CLI.

Language Basics

Language basics is kind of a catch all for absolute beginner stuff. The items (common names) I chose for language basics is a bit random and include items like case sensitivity, commenting, declaring variables, etc.

Constants

[Other Languages]

General Info: Computer Language Constants

A constant is just like a variable (it holds a value) but, unlike a variable, you cannot change the value of a constant.

PHP: define

In PHP, you declare constants using the define keyword:

define("CONST_NAME", "Value");

Constants in PHP are case sensitive. A common standard in PHP is to use all-uppercase letters, with underscores to separate words within the name.

Syntax Example:

define('FULL_NAME', 'Mike Prestwood');
define("AGE", 25);

echo "Your name is " . FULL_NAME . ".";
echo "You are " . AGE . ".";

PHP Constants (define)

C++/CLI: const or literal

C++/CLI supports the const and static const keywords of standard C++ as well as the new literal keyword. A literal is equivalent to static const in standard C++ and Microsoft's documentation recommends to replace static const with the new literal keyword because a literal is available in metadata; a static const variable is not available in metadata to other compilers.

You can use static const within the class declaration or locally within a method. However, literal is only valid in the class declaration section and const is only valid within a method.

Syntax Example: 1 certification question.

//some method {

const String^ MyName = "John";
static const Int32 MyAge = 27;

//}

// public class SomeClass : public Object {
public:
  literal double Pi = 3.14159;
  literal String^ MyName = "Mike";
  static const Int32 MyAge = 35;

//...

Ref: http://msdn.microsoft.com/en-us/library/ms235301(VS.80).aspx