Web Reference: 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. Feb 28, 2012 · When it comes to PHP commands you rarely need worry about capital and lowercase letters. The command will work with what casing you use. Learn about case sensitivity in PHP. Understand how PHP treats keywords and functions as case-insensitive, while variables are case-sensitive, with clear examples.
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