Lester Caine in php.internals (Thu, 05 Mar 2015 21:46:15 +0000):
>On 05/03/15 21:19, Jan Ehrhardt wrote:
>> BTW: Piwik heavily uses $$ even in
>> the latest releases, so it is not as old-style-coding as you might
>> think.
>
>Thanks for that Jan ... my own port of piwik is on the todo list here!

Grep '\$\$' tricked me a little bit: most of the $$'s were in js-files.
While looking further I only found remaining $$'s in tcpdf.php. That is
a library that started in 2002, so even a little earlier than my legacy
code.

Jan

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