Merge from Trunk

simplexml->query returns empty array if no nodes were found
and false if libxml thinks the xpath-expression was invalid.
Behaves now the same like DomXPath and fixes Bug #48601
Adjusted a test to reflect that change

NEWS

@@ -26,6 +26,12 @@ PHP                                                                        NEWS
   . Don't set $_SERVER['HTTPS'] on unsecure connection (bug #55403). (Uwe
     Schindler)
 
+- SimpleXML:
+  . Reverted the SimpleXML->query() behaviour to returning empty arrays
+    instead of false when no nodes are found as it was since 5.3.3 
+    (bug #48601). (chregu, rrichards)
+    
+
 23 Aug 2011, PHP 5.3.8
 
 - Core:

ext/simplexml/simplexml.c

@@ -1264,8 +1264,9 @@ SXE_METHOD(xpath)
 
 	result = retval->nodesetval;
 
+	array_init(return_value);
+		
 	if (result != NULL) {
-		array_init(return_value);
 		for (i = 0; i < result->nodeNr; ++i) {
 			nodeptr = result->nodeTab[i];
 			if (nodeptr->type == XML_TEXT_NODE || nodeptr->type == XML_ELEMENT_NODE || nodeptr->type == XML_ATTRIBUTE_NODE) {
@@ -1286,8 +1287,6 @@ SXE_METHOD(xpath)
 				add_next_index_zval(return_value, value);
 			}
 		}
-	} else {
-		RETVAL_FALSE;
 	}
 
 	xmlXPathFreeObject(retval);

ext/simplexml/tests/008.phpt

@@ -25,7 +25,10 @@ EOF;
 $sxe = simplexml_load_string($xml);
 
 var_dump($sxe->xpath("elem1/elem2/elem3/elem4"));
+//valid expression 
 var_dump($sxe->xpath("***"));
+//invalid expression 
+var_dump($sxe->xpath("**"));
 ?>
 --EXPECTF--
 array(1) {
@@ -36,4 +39,10 @@ array(1) {
     }
   }
 }
+array(0) {
+}
+
+Warning: SimpleXMLElement::xpath(): Invalid expression in %s on line %d
+
+Warning: SimpleXMLElement::xpath(): xmlXPathEval: evaluation failed in %s on line %d
 bool(false)