Constant names, like variable names, must begin with a $.

Name: Constant names, like variable names, must begin with a $.
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Quizplus · Accepted Answer

Constant names in many programming languages, including PHP, do not begin with a $ symbol; that notation is reserved for variables. Constants are typically defined using functions like `define()` and are accessed by directly using their name without a $ prefix.

Constant Names, Like Variable Names, Must Begin with a