From 0d60e32584aeb64d0f4b8844c5ef49e57a0eada2 Mon Sep 17 00:00:00 2001
From: Silvio <s1lv10@uol.com.br>
Date: Tue, 27 Apr 2010 18:10:58 -0300
Subject: Checking namespace availability before asking for metadata

---
 exif.class.php | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/exif.class.php b/exif.class.php
index 62f01c5..3913927 100644
--- a/exif.class.php
+++ b/exif.class.php
@@ -173,6 +173,9 @@ Class Exif {
 
     // Get XMP metadata into the object.
     if ($xmpfiles->GetXMP($xmpmeta)) {
+      // Sort metadata.
+      $xmpmeta->Sort();
+
       return array('files' => $xmpfiles, 'meta' => $xmpmeta);
     }
 
@@ -210,18 +213,17 @@ Class Exif {
     $xmpfiles = $xmp['files'];
     $xmpmeta  = $xmp['meta'];
 
-    // Sort.
-    $xmpmeta->Sort();
-
-    // Read XMP data.
-    if ($config['type'] == 'property') {
-      $value = @$xmpmeta->GetProperty($config['name'], $config['ns']);
-    }
-    elseif ($config['type'] == 'array') {
-      $value = @$xmpmeta->GetArrayItem($config['name'], $key, $config['ns']);
-    } 
-    elseif ($config['type'] == 'struct') {
-      $value = @$xmpmeta->GetStructField($config['ns'], $config['struct'], $config['ns'], $config['name']);
+    // Try to read XMP data if the namespace is available.
+    if(@$xmpmeta->GetNamespacePrefix($config['ns'])) {
+      if ($config['type'] == 'property') {
+        $value = @$xmpmeta->GetProperty($config['name'], $config['ns']);
+      }
+      elseif ($config['type'] == 'array') {
+        $value = @$xmpmeta->GetArrayItem($config['name'], $key, $config['ns']);
+      } 
+      elseif ($config['type'] == 'struct') {
+        $value = @$xmpmeta->GetStructField($config['ns'], $config['struct'], $config['ns'], $config['name']);
+      }
     }
 
     return $value;
-- 
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