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. Variables in PHP are represented by a dollar sign followed by the name of the variable. The variable name is case-sensitive. A valid variable name starts with a letter (A-Z, a-z, or the bytes from 128 through 255) or underscore, followed by any number of letters, numbers, or underscores. Like HTML, you need to have the opening tag to start PHP code: If you mix PHP code with HTML, you need to have the enclosing tag: For example: However, if a file contains only PHP code, the enclosing tag is optional:
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