php - Unexpected T_PAAMAYIM_NEKUDOTAYIM, expecting T_NS_Separator

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I moved an application from
an href="http://en.wikipedia.org/wiki/List_of_Ubuntu_releases#Ubuntu_11.04_.28Natty_Narwhal.29"
rel="nofollow">Ubuntu 11.04 (Natty Narwhal) Server to a href="http://en.wikipedia.org/wiki/Red_Hat_Linux" rel="nofollow">Red Hat Enterprise
Linux (RHEL) server over the weekend. My error log is full of the PHP errors
in the subject line referencing the following
function:

function
            wfTalkHereArticleFromTitle( &$title, &$article ) {
 global $wgRequest,
            $wgTalkHereNamespaces;

 if
            (isset($title->noTalkHere))
 return true; //Stop
            recursion

 $action = $wgRequest->getVal( 'action' );

            $oldid = $wgRequest->getVal( 'oldid' );

 $diff =
            $wgRequest->getVal( 'diff' );

 if ($action ==
            'purge')
 $action = NULL; //"purge" is not considered an action in this
            context

 if ($action || $oldid || $diff)
 return
            true;

 $ns =
            $title->getNamespace();


 if (!Namespace::isTalk($ns)
            && Namespace::canTalk($ns) && $title->exists()
 &&
            ( !$wgTalkHereNamespaces || in_array($ns, $wgTalkHereNamespaces) ) )
            {

 $tns = Namespace::getTalk($ns);
 $talk =
            Title::makeTitle($tns, $title->getDBKey());

 if ($talk
            && $talk->userCan('read')) {
 $t = clone $title;

            $t->noTalkHere = true; //Stop recursion


 $a =
            MediaWiki::articleFromTitle( $t );
 $article = new TalkHereArticle( $a, $talk
            );
 }
 }
 return
            true;
}

The
error is thrown in
the

If
            (!Namespace::isTalk($ns)

statement.
This error is a new one for me. How might I resolve
it?

I changed the offending code
to:

if ( !Ns::isTalk($ns)
            && Ns::canTalk($ns) && $title->exists()
 && (
            !$wgTalkHereNamespaces || in_array($ns, $wgTalkHereNamespaces) ) )
            {


 $tns = Ns::getTalk($ns);
 $talk =
            Title::makeTitle($tns, $title->getDBKey());

 if ($talk
            && $talk->userCan('read')) {
 $t = clone $title;

            $t->noTalkHere = true; //Stop recursion

 $a =
            MediaWiki::articleFromTitle( $t );
 $article = new TalkHereArticle( $a, $talk
            );
 }

}
return
            true;

Would that
suffice to fix the error, at least in this file?

Answer

It looks like your new server is running PHP
5.3, while your old one was running an earlier
version.

In PHP 5.3,
namespace is a keyword, thanks to the href="http://us2.php.net/manual/en/language.namespaces.php" rel="noreferrer">new
namespace feature.

Your
existing Namespace class is going to need to be renamed. The
parse error is occurring as the code tries to resolve
Namespace::isTalk() into a namespace name. (The syntax for
doing so would be something akin to namespace Foo; it becomes
confused at seeing the :: resolution
operator.)