Merge pull request #251 from mikehaertl/249-fix-null-values

Issue #249 Fix infinite loop with null values in form data

Author: mikehaertl

src/XfdfFile.php

@@ -184,7 +184,7 @@ protected function writeFields($fp, $fields)
             if (!is_array($value)) {
                 $value = array($value);
             }
-            if (isset($value[0])) {
+            if (array_key_exists(0, $value)) {
                 // Numeric keys: single or multi-value field
                 foreach($value as $val) {
                     $val = $this->xmlEncode($val);

tests/XfdfFileTest.php

@@ -25,6 +25,7 @@ public function testXfdfFileCreation()
             'multivalue1' => array('val1', 'val2'),
             'nested.dummy' => 'valX',
             'nested.multivalue2' => array('val3', 'val4'),
+            'nullValue' => null,
         );
 
         $oXfdfFile = new XfdfFile($data, null, null, __DIR__);

tests/files/XfdfFileTest.xfdf

@@ -59,5 +59,8 @@
 <value>val4</value>
 </field>
 </field>
+<field name="nullValue">
+<value></value>
+</field>
 </fields>
 </xfdf>