In, for example, http://php.net/source.php?url=/include/prepend.inc, the opening PHP tag used looks like this: <?php // -*- C++ -*- (not just <?php).
What does that mean, and what’s C++ got to do with it?
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Some editors see the
-*- C++ -*-part, and enable C++ syntax for the file. It has nothing to do with PHP, and indeed is commented out so PHP will skip it.