Web Reference: PHP Case Sensitivity. Learning php full course. PHP basic tutorial. PHP tutorial for beginners. Learn PHP. Is PHP is case-sensitive? PHP keywords are not case-sensitive. Oct 22, 2015 · Variables in PHP are represented by a dollar sign followed by the variable's name. The variable name is case-sensitive. Variable names follow the same rules as other labels in PHP. A valid variable name starts with a letter or underscores, followed by any number of letters, numbers, or underscores. Aug 24, 2022 · In PHP, variables and constants are case sensitive, while functions are not case sensitive. PHP classes are a mix between variables and functions, so they are partially case-sensitive.
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