constant
PHP 4 >= 4.0.4, PHP 5, PHP 7, PHP 8
constant - Returns the value of a constant
Manual
constant(
string$name ): mixed
Return the value of the constant indicated by name.
constant is useful if you need to retrieve the value of a constant, but do not know its name. I.e. it is stored in a variable or returned by a function.
This function works also with class constants.
Parameters
- name
-
The constant name.
Return Values
Returns the value of the constant.
Exceptions and Errors
An Error exception is thrown, if the constant is not defined. Prior to PHP 8.0.0, an E_WARNING level error was generated in that case.
Changelog
| Version | Description |
| 8.0.0 | If the constant is not defined, constant now throws an Error exception; previously an E_WARNING was generated, and null was returned. |