CONSTANTS and PHP Class Definitions Using "define('MY_VAR', 'default value')" INSIDE a class definition does not work as expected.

Get all the constants defined in the class, loop over them and compare the values of those constants with the value of your variable. PHP class parser to get the list of class constants doc comments - researchgate/php-constant-doc-comment I once heard it's good to have one class with all your application constants so that you have only one location with all your constants. Proposal for RFC: get_class_constants() Groups: php.internals : Hi, following the howto for RFCs and since this would be my first one, I'd like to ask for your thoughts if such an RFC might find approval. Ask Question Asked 10 years, 11 months ago. Accessing PHP Class Constants (3) . PHP - Constants Types. Note: Unlike variables, constants are automatically global across the entire script. class MyFooBar implement FooBar { } echo MyFooBar::FOO; // 1 My own take on this is that anything Global is Evil. From PHP 5.6 onwards, it is possible to define a constant as a scalar expression, and it is also possible to define an array constant. However, it is recommended to name the constants in all uppercase letters. Edit: the short answer to your question is no. The get_defined_constants() function takes one optional parameter, which specifies whether or not to categorise the constants. Proposal: Create a function get_class_constants() It would be similar to get_class_methods() and get_class_vars().

By default, a constant is case-sensitive. Class constants can be useful if you need to define some constant data within a class.
Like static members, constant values can not be accessed from an instance of the object. But I can't create a class constant from an expression like that: The value must be a constant expression, not (for example) a variable, a property, a result of a mathematical operation, or a function call. – halfer Apr 29 '12 at 0:17 PHP What is OOP PHP Classes/Objects PHP Constructor PHP Destructor PHP Access Modifiers PHP Inheritance PHP Constants PHP Abstract Classes PHP Traits PHP Static Methods PHP Static Properties MySQL Database MySQL Database MySQL Connect MySQL Create DB MySQL Create Table MySQL Insert Data MySQL Get Last ID MySQL Insert Multiple MySQL Prepared MySQL Select Data MySQL Where … The PHP manual says . (13 replies) Hi, following the howto for RFCs and since this would be my first one, I'd like to ask for your thoughts if such an RFC might find approval. example: interface FooBar { const FOO = 1; const BAR = 2; } echo FooBar::FOO; // 1 Any implementing class will automatically have these constants available, e.g.

Constants cannot be changed once it is declared.

I Tried to do it this way: class constants{ define("EH_MAILER",1); } and . If yes, I'll be happy to work on it. Either define a constant in the abstract class (thus every child class has a constant, even if it does not define its own), or use an abstract function (which forces every child class to define its own). By convention, constant identifiers are always uppercase. Next Page . PHP - Class Constants. It is possible to define constants as a resource, but it should be avoided, as it can cause unexpected results. Previous Page. The value cannot be changed during the script. Viewed 3k times 3.

Proposal: Create a function get_class_constants() It would be similar to get_class_methods() and get_class_vars(). I'm attempting to get a list of class constants from within a static method. PHP Constants. PHP has the function get_defined_constants() which allows you to get a list of all the available constants in an array. Active 1 year, 5 months ago.

A class constant is declared inside a class with the const keyword. Note that with this approach you might get some other constant that the one you want, if there are two constants with the same value.