CONSTANT(3) 1 CONSTANT(3)
constant - Returns the value of a constant
SYNOPSIS
mixed constant (string $name)
DESCRIPTION
Return the value of the constant indicated by $name.
constant(3) 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
o $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(3) example
<?php
define("MAXSIZE", 100);
echo MAXSIZE;
echo constant("MAXSIZE"); // same thing as the previous line
interface 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!"
?>
SEE ALSO
define(3), defined(3), The section on Constants.
PHP Documentation Group CONSTANT(3)