* changeless: unvarying in nature; "maintained a constant temperature"; "principles of unvarying validity" * steadfast in purpose or devotion or affection; "a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star" * a quantity that does not vary * a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant" * ceaseless: uninterrupted in time and indefinitely long continuing; "the ceaseless thunder of surf"; "in constant pain"; "night and day we live with the incessant noise of the city"; "the never-ending search for happiness"; "the perpetual struggle to maintain standards in a democracy"
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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.