[pmwiki-devel] $zz in defintion for (:title ... :)
Patrick R. Michaud
pmichaud at pobox.com
Tue Oct 31 09:24:33 CST 2006
On Tue, Oct 31, 2006 at 02:01:13AM -0500, Stirling Westrup wrote:
> I was just reading through the PmWiki code trying to figure out how to
> do something, and I noticed the definition of the (:title ... :)
> directive goes like this:
> ## (:title:)
> \$zz=array('title' => SetProperty(\$pagename, 'title',
> Can anyone tell me why that \$zz is in there?
At one point the PCache() function was defined such that
its second paramter was being passed by reference, instead
of being passed by value. As a result, the second argument
to PCache() had to be a true variable and not just a
So, the $zz= trick assigns the array to a temporary variable,
and passes that variable by reference.
However, I've since found out that PHP uses copy-on-write
for arrays passed as parameters, so there's little need
for PCache() to be receiving its second argument by reference.
So, this little hack will likely be going away soon.
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