constant

Returns the value of a constant (PHP 4 >= 4.0.4, PHP 5)
mixed constant ( string name )

constant() will 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.

例 1146. constant() example

<?php

define
("MAXSIZE", 100);

echo
MAXSIZE;
echo
constant("MAXSIZE"); // same thing as the previous line

?>

See also define(), defined() and the section on Constants.