support php versions without json support and show a warning message

3 files changed, 21 insertions, 2 deletions

diff --git a/graph.php b/graph.php
index 2c3f6e6..6206d73 100644
--- a/graph.php
+++ b/graph.php
@@ -35,7 +35,7 @@ if ($plugin == 'aggregation') {
 }
 
 # plugin json
-if (file_exists('plugin/'.$plugin.'.json')) {
+if (function_exists('json_decode') && file_exists('plugin/'.$plugin.'.json')) {
         $json = file_get_contents('plugin/'.$plugin.'.json');
         $plugin_json = json_decode($json, true);
 
diff --git a/inc/html.inc.php b/inc/html.inc.php
index 9107269..c8cfbaf 100644
--- a/inc/html.inc.php
+++ b/inc/html.inc.php
@@ -54,6 +54,19 @@ echo <<<EOT
   <h1><a href="{$html_weburl}">Collectd Graph Panel</a></h1>
 </div>
 
+EOT;
+
+        if(!function_exists('json_decode')) {
+                echo <<<EOT
+<div id="warnheader">
+        Your php version doesn't support <a href="http://php.net/json">JSON</a>. Your graphs would have looked more beautiful if it did.
+</div>
+
+EOT;
+
+        }
+
+echo <<<EOT
 <div id="content">
 
 EOT;
diff --git a/layout/style.css b/layout/style.css
index 3d5c94b..e344cf7 100644
--- a/layout/style.css
+++ b/layout/style.css
@@ -15,6 +15,12 @@ body {
         text-decoration: none;
 }
 
+#warnheader {
+        background: #ffe583;
+        padding: 8px 8px 8px 18px;
+        border-bottom: 1px solid #d5ad14;
+}
+
 #content {
         padding-left: 20px;
 }
@@ -25,7 +31,7 @@ body {
 }
 
 h1 {
-        margin-top: 0;
+        margin: 0;
         font-size: 1em;
 }