Fixing bug when value is '0', it was generating a blank node.

cake/libs/xml.php

@@ -227,7 +227,7 @@ function normalize($object, $keyName = null, $options = array()) {
 			$chldObjs = get_object_vars($object);
 		} elseif (is_array($object)) {
 			$chldObjs = $object;
-		} elseif (!empty($object) || $object === 0) {
+		} elseif (!empty($object) || $object === 0 || $object === '0') {
 			$node->createTextNode($object);
 		}
 		$attr = array();
@@ -268,7 +268,7 @@ function normalize($object, $keyName = null, $options = array()) {
 							$node->normalize($val, $n, $options);
 						} elseif ($options['format'] == 'tags' && $this->__tagOptions($key) !== false) {
 							$tmp =& $node->createElement($key);
-							if (!empty($val) || $val === 0) {
+							if (!empty($val) || $val === 0 || $val === '0') {
 								$tmp->createTextNode($val);
 							}
 						} elseif ($options['format'] == 'attributes') {

cake/tests/cases/libs/xml.test.php

@@ -176,6 +176,19 @@ function testSimpleObject() {
 		$expected = '<hello><![CDATA[world]]></hello>';
 		$this->assertEqual($expected, $result);
 	}
+/**
+ * testSimpleArrayWithZeroValues method
+ *
+ * @access public
+ * @return void
+ */
+	function testSimpleArrayWithZeroValues() {
+		$xml = new Xml(array('zero_string' => '0', 'zero_integer' => 0), array('format' => 'tags'));
+
+		$result = $xml->toString(false);
+		$expected = '<zero_string>0</zero_string><zero_integer>0</zero_integer>';
+		$this->assertEqual($expected, $result);
+	}
 /**
  * testHeader method
  *
@@ -761,7 +774,7 @@ function testElementCollapsing() {
 	}
 /**
  * test that empty values do not casefold collapse
- * 
+ *
  * @see http://code.cakephp.org/tickets/view/8
  * @return void
  **/
@@ -797,7 +810,7 @@ function testCaseFoldingWithEmptyValues() {
 				<name>varchar(45)</name>
 			</User>
 		</method>';
-		
+
 		$xml =& new XML($emptyValue);
 		$expected = array(
 			'Method' => array(