used syntax isn't available in PHP5.4 You will get this error:

[Thu Apr 21 15:20:39 2016] [error] [client 131.152.226.242] PHP Fatal error: Can't use method return value in write context in /usr/local/vufind/httpd/module/Swissbib/src/Swissbib/RecordDriver/SolrMarc.php on line 1128, referer: https://test.swissbib.ch/ we need PHP versions >= 5.5
swissbib · Apr 21, 2016 · d8c5f8c · d8c5f8c
1 parent 4ed1256
commit d8c5f8c
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/module/Swissbib/src/Swissbib/RecordDriver/SolrMarc.php b/module/Swissbib/src/Swissbib/RecordDriver/SolrMarc.php
@@ -1125,7 +1125,8 @@ public function getSecondaryAuthors($asString = true)
      */
     public function getCorporateAuthors()
     {
-        return empty($this->getCorporateAuthor()) ?
+        $tempAuthor = $this->getCorporateAuthor();
+        return empty($tempAuthor) ?
             null : [$this->getCorporateAuthor()];
     }