Pravila za PHP promenljive:
- promenljiva pocinje sa $ znakom, nakon cega sledi ime promenljive
 - naziv promenljive treba poceti sa slovom ili znak podvlakom
 - ime promenljive ne moze poceti s brojem
 - naziv promenljive moze sadrzati samo alfanumericke znakove i podvlake (AZ, 0-9 i _)
 - Imena promenljivih - razlikuju velika i mala slova ($godine i $GODINE su dve razliite promenljive)
 
Rules for PHP variables:
variable begins with the $ sign, followed by a variable name
variable name should begin with a letter or an underscore character
variable name can not begin with a number
variable name can contain only alphanumeric characters and underscores (AZ, 0-9)
Variable names - are case sensitive ($ year and $ YEAR are two different variables)
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