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newbee question - double colon


jparr2000

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Sometimes I see double colon in code.

What is it and how is it called, so I can Google for it and do some learning.

 

 

Samples:

 

!preg_match(self::$re_valid_dom, $string)

 

or this

 

file(self::etld_fetch_list())

 

Sorry for stupid question, but if I know what to look for I could study and understand it.

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