Changing CImage::output() as proposed in #37.

CImage.php

@@ -1547,10 +1547,8 @@ class CImage
 
         $this->log("Outputting image: $file");
 
-        // Get details on image
-        $info = list($width, $height, $type, $attr) = getimagesize($file);
-        !empty($info) or $this->raiseError("The file doesn't seem to be an image.");
-        $mime = $info['mime'];
+        // Get image modification time
+        clearstatcache();
         $lastModified = filemtime($file);
         $gmdate = gmdate("D, d M Y H:i:s", $lastModified);
 
@@ -1576,6 +1574,11 @@ class CImage
                 exit;
             }
 
+            // Get details on image
+            $info = getimagesize($file);
+            !empty($info) or $this->raiseError("The file doesn't seem to be an image.");
+            $mime = $info['mime'];
+
             header('Content-type: ' . $mime);
             readfile($file);
         }

README.md

@@ -133,6 +133,7 @@ Revision history
 
 v0.5.x (latest)
 
+* Changing `CImage::output()` as proposed in #37.
 * Adding security check that image filename is always below the path `image_path` as specified in `img_config.php` #37.
 * Adding configuration item in `img_config.php` for setting valid characters in image filename.
 * Moving `webroot/test*` into directory `webroot/test`.