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A [real] constant.
C.
what is the unit of Stefan constant
Generally, constant names are case sensitive in PHP.But... you can do a trick. If you will be consistent and all constant name will be defines as uppercase, you can access them using a combination of constant() and strtoupper() functions. Look at this example:?phpdefine(MY_CONSTANT, "HELLO");echo constant(strtoupper(my_constant));echo "";echo constant(strtoupper(My_Constant));echo "";echo constant(strtoupper(my_CONSTANT));?>
There are several different universal constants: Avogadro's number, Gas constant, Gravitational constant. The question needs to be more specific.