constant

Description

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.

例子 1. 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 .