Merge pull request #55 from skilld-labs/env-output-dir

Allow to override xhprof.output_dir via env

Author: longxinH

xhprof_lib/utils/xhprof_runs.php

@@ -91,7 +91,7 @@ public function __construct($dir = null) {
     // if specified, else we default to the directory
     // in which the error_log file resides.
 
-    if (empty($dir)) {
+    if (empty($dir) && !($dir = getenv('XHPROF_OUTPUT_DIR'))) {
       $dir = ini_get("xhprof.output_dir");
       if (empty($dir)) {
 
@@ -101,7 +101,7 @@ public function __construct($dir = null) {
                      "Trying {$dir} as default. You can either pass the " .
                      "directory location as an argument to the constructor ".
                      "for XHProfRuns_Default() or set xhprof.output_dir ".
-                     "ini param.");
+                     "ini param, or set XHPROF_OUTPUT_DIR environment variable.");
       }
     }
     $this->dir = $dir;