Since PHP 5.6, you can declare an array constant with const: <?php const DEFAULT_ROLES = array(‘guy’, ‘development team’); The short syntax works too, as you’d expect: <?php const DEFAULT_ROLES = [‘guy’, ‘development team’]; If you have PHP 7, you can finally use define(), just as you had first tried: <?php define(‘DEFAULT_ROLES’, array(‘guy’, ‘development team’));
const is pointless when the argument is passed by value since you will not be modifying the caller’s object. Wrong. It’s about self-documenting your code and your assumptions. If your code has many people working on it and your functions are non-trivial then you should mark const any and everything that you can. When writing … Read more
You have to define your static member outside the class definition and provide the initializer there. First // In a header file (if it is in a header file in your case) class A { private: static const string RECTANGLE; }; and then // In one of the implementation files const string A::RECTANGLE = “rectangle”; … Read more
The recommended naming and capitalization convention is to use PascalCasing for constants (Microsoft has a tool named StyleCop that documents all the preferred conventions and can check your source for compliance – though it is a little bit too anally retentive for many people’s tastes). e.g. private const int TheAnswer = 42; The Pascal capitalization … Read more
The difference here is that char *s = “Hello world”; will place “Hello world” in the read-only parts of the memory, and making s a pointer to that makes any writing operation on this memory illegal. While doing: char s[] = “Hello world”; puts the literal string in read-only memory and copies the string to … Read more
const is like let, it is a LexicalDeclaration (VariableStatement, Declaration) used to define an identifier in your block. You are trying to mix this with the default keyword, which expects a HoistableDeclaration, ClassDeclaration or AssignmentExpression to follow it. Therefore it is a SyntaxError. If you want to const something you need to provide the identifier … Read more
Yes, but you need to declare it readonly instead of const: public static readonly string[] Titles = { “German”, “Spanish”, “Corrects”, “Wrongs” }; The reason is that const can only be applied to a field whose value is known at compile-time. The array initializer you’ve shown is not a constant expression in C#, so it … Read more
It depends on what you need the value for. You (and everyone else so far) omitted the third alternative: static const int var = 5; #define var 5 enum { var = 5 }; Ignoring issues about the choice of name, then: If you need to pass a pointer around, you must use (1). Since … Read more
A “const function”, denoted with the keyword const after a function declaration, makes it a compiler error for this class function to change a member variable of the class. However, reading of a class variables is okay inside of the function, but writing inside of this function will generate a compiler error. Another way of … Read more
As of PHP 5.3 there are two ways to define constants: Either using the const keyword or using the define() function: const FOO = ‘BAR’; define(‘FOO’, ‘BAR’); The fundamental difference between those two ways is that const defines constants at compile time, whereas define defines them at run time. This causes most of const‘s disadvantages. … Read more