Constants

This chapter covers how to define a global constant.

Code sample for this chapter, with additional examples, is available here.

Userland PHP Code Snippet

The code below shows how a constant would be declared in userland PHP code.

const HELLO = 'World!';

The following sections show all required code to declare and implement a constant internally in PHP.

The stub file should not declare global constants as the stub generator script (gen_stub.php) cannot handle it at this moment.

Constants are not referred to nor registered in the argument information file, so it can be skipped.

The implementation below is very simple and straight forward:

declaration (REGISTER_MAIN_STRING_CONSTANT)
- name string ("HELLO")
- value string ("World!")
- flags (CONST_CS and CONST_PERSISTENT)

REGISTER_MAIN_STRING_CONSTANT("HELLO", "World!", CONST_CS | CONST_PERSISTENT);

Macros and Functions:

References:

Note that constants must be registered during the MINIT() stage.