Test existance of image functions and log an error if they do not exist.

Author: lmartelli

server/php/UploadHandler.php

@@ -279,6 +279,10 @@ protected function create_scaled_image($file_name, $version, $options) {
         } else {
             $new_file_path = $file_path;
         }
+        if (!function_exists('getimagesize')) {
+            error_log('Function not found: getimagesize');
+            return false;
+        }
         list($img_width, $img_height) = @getimagesize($file_path);
         if (!$img_width || !$img_height) {
             return false;
@@ -295,6 +299,11 @@ protected function create_scaled_image($file_name, $version, $options) {
             }
             return true;
         }
+
+        if (!function_exists('imagecreatetruecolor')) {
+            error_log('Function not found: imagecreatetruecolor');
+            return false;
+        }
         if (empty($options['crop'])) {
             $new_width = $img_width * $scale;
             $new_height = $img_height * $scale;