Add gc_mem_caches() call for PHP7 after itoken_get_all() as new memory manager will not release small buckets to OS automatically

Author: Peter Ward

Translation/PhpExtractor.php

@@ -61,6 +61,11 @@ public function extract($directory, MessageCatalogue $catalog)
         $files = $finder->files()->name('*.php')->in($directory);
         foreach ($files as $file) {
             $this->parseTokens(token_get_all(file_get_contents($file)), $catalog);
+
+            if (PHP_VERSION_ID >= 70000) {
+                // PHP 7 memory manager will not release after token_get_all(), see https://bugs.php.net/70098
+                gc_mem_caches();
+            }
         }
     }