Converting a string to a defined constant in PHP

Let's say I have defined the constant ERROR_0 as follows:

define("ERROR_0","An error occurred.")

Now, let's say I have the string "ERROR_0" but I want to convert that into the constant ERROR_0 such that I can get the string "An Error occurred." How can I do that?

Thanks!

php string constants

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Converting a string to a defined constant in PHP

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