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Function names follow the same rules as other labels in PHP. A valid function name starts with a letter or underscore, followed by any number of letters, numbers, or underscores. As a regular expression, it would be expressed thus: [a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*.
I think that this "heart" symbol should be in 7f-ff range ...
There are 10 types of people in this world, those who understand binary and those who don't