The variable name must start with the dollar sign ($).
PHP variables are case-sensitive. It means that $age and $Age variables are entirely different.
The first character after the dollar sign ( $) must be a letter (a-z) or the underscore ( _ ).
The first character after dollar sign ($) can not be number.
A variable name can only contain alpha-numeric characters and underscores (A-z, 0-9, and _ )
In PHP, a variable starts with the $ sign. PHP automatically associates a data type to the variable, depending on its value.
Syntax
$variableName = "";
example:
$friendName="Ravi";
Remember that PHP variable names are case-sensitive!
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