PHP constant() Function

The constant() function returns the value of a constant.

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.

Example -

ParameterDescription
nameRequired. Specifies the name of the constant to check

Return Values

Returns the value of the constant, or NULL if the constant is not defined.