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constant
Returns the value of a constant
(PHP 4 >= 4.0.4, PHP 5)
mixed constant ( string name )
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.
Examples
Example 1351. constant() example
<?php
define("MAXSIZE", 100);
echo MAXSIZE;
echo constant("MAXSIZE"); // same thing as the previous line
?>