PHP constant function

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constant

(PHP 4 >= 4.0.4, PHP 5)

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.

The constant name.

Returns the value of the constant, or NULL if the constant is not
defined.

Example 1. constant() example

 
define("MAXSIZE", 100);
 
echo MAXSIZE;
echo constant("MAXSIZE"); // same thing as the previous line