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Variable

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Description

A variable is used represent one of the following data types:

A variable name must begin with a dollar sign ($) immediately followed by a letter. The remainder of the variable name may comprise only of letters, numbers and underscores (_).

Variable names are case-insensitive.

Examples
Alchemy
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$My_4_Element_Array = [1, 2, 3, 4];
$my_number = 512;
$aString = "Farewell cruel world!";
$bool = "true";