PHP. Руководство по PHP. 2005
constant
constant
Description
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.
Пример 1. constant() example
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See also define(), defined() and the section on Constants.
connection_timeout
define