What is the purpose of constant() function?

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As indicated by the name, this function will return the value of the constant. This is useful when you want to retrieve value of a constant, but you do not know its name, i.e. It is stored in a variable or returned by a function.

define("GlobalGuideline", 50);
echo GlobalGuideline;
echo constant("GlobalGuideline"); // same thing as the previous line
Only scalar data (boolean, integer, float and string) can be contained in constants.
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