Returns the value of a constant (original) (raw)
(PHP 4 >= 4.0.4, PHP 5, PHP 7)
constant — Returns the value of a constant
Description
constant ( string $name ) : mixed
Return the value of the constant indicated byname.
constant() is useful if you need to retrieve the value of a constant, but do not know its name. I.e. it is stored in a variable or returned by a function.
This function works also with class constants.
Parameters
name
The constant name.
Return Values
Returns the value of the constant, or NULL if the constant is not defined.
Errors/Exceptions
An E_WARNING level error is generated if the constant is not defined.
Examples
Example #1 constant() example
`<?php
define
("MAXSIZE", 100);
echo
MAXSIZE;
echo constant("MAXSIZE"); // same thing as the previous lineinterface bar {
const test = 'foobar!';
}
class
foo {
const test = 'foobar!';
}$const = 'test';var_dump(constant('bar::'. $const)); // string(7) "foobar!"
var_dump(constant('foo::'. $const)); // string(7) "foobar!"?> `