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What is the purpose of constant() function?


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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