兼容php5.2

plugins/xhprof/lib/xhprof_lib/utils/xhprof_runs.php

@@ -55,7 +55,6 @@ interface iXHProfRuns {
     public function save_run($xhprof_data, $type, $run_id = null);
 }
 
-
 /**
  * XHProfRuns_Default is the default implementation of the
  * iXHProfRuns interface for saving/fetching XHProf runs.
@@ -145,11 +144,15 @@ class XHProfRuns_Default implements iXHProfRuns {
         return $run_id;
     }
 
+    function list_runs_callback($a, $b) {
+        return filemtime($b) - filemtime($a);
+    }
+
     function list_runs() {
         if (is_dir($this->dir)) {
             echo "<hr/>Existing runs:\n<ul>\n";
             $files = glob("{$this->dir}/*.{$this->suffix}");
-		usort($files, function($a, $b) {return filemtime($b) - filemtime($a);});
+            usort($files, 'list_runs_callback');
             foreach ($files as $file) {
                 list($run, $source) = explode('.', basename($file));
                 echo '<li><a href="' . htmlentities($_SERVER['SCRIPT_NAME'])