fix bug #49490 (XPath namespace prefix conflict)

add test

NEWS

@@ -126,6 +126,7 @@ PHP                                                                        NEWS
 - Fixed bug #49700 (memory leaks in php_date.c if garbage collector is
   enabled). (Dmitry)
 - Fixed bug #49576 (FILTER_VALIDATE_EMAIL filter needs updating) (Rasmus)
+- Fixed bug #49490 (XPath namespace prefix conflict). (Rob)
 - Fixed bug #49429 (odbc_autocommit doesn't work). (Felipe)
 - Fixed bug #49234 (mysqli_ssl_set not found). (Andrey)
 - Fixed bug #49192 (PHP crashes when GC invoked on COM object). (Stas)

ext/dom/tests/bug49490.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Bug #49490 (XPath namespace prefix conflict).
+--SKIPIF--
+<?php require_once('skipif.inc'); ?>
+--FILE--
+<?php
+$doc = new DOMDocument();
+$doc->loadXML('<prefix:root xmlns:prefix="urn:a" />');
+
+$xp = new DOMXPath($doc);
+$xp->registerNamespace('prefix', 'urn:b');
+
+echo($xp->query('//prefix:root', null, false)->length . "\n");
+
+?>
+--EXPECT--
+0

ext/dom/xpath.c

@@ -48,12 +48,14 @@ ZEND_END_ARG_INFO();
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_dom_xpath_query, 0, 0, 1)
 	ZEND_ARG_INFO(0, expr)
-	ZEND_ARG_OBJ_INFO(0, context, DOMNode, 0)
+	ZEND_ARG_OBJ_INFO(0, context, DOMNode, 1)
+	ZEND_ARG_INFO(0, registerNodeNS)
 ZEND_END_ARG_INFO();
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_dom_xpath_evaluate, 0, 0, 1)
 	ZEND_ARG_INFO(0, expr)
-	ZEND_ARG_OBJ_INFO(0, context, DOMNode, 0)
+	ZEND_ARG_OBJ_INFO(0, context, DOMNode, 1)
+	ZEND_ARG_INFO(0, registerNodeNS)
 ZEND_END_ARG_INFO();
 
 ZEND_BEGIN_ARG_INFO_EX(arginfo_dom_xpath_register_php_functions, 0, 0, 0)
@@ -385,9 +387,10 @@ static void php_xpath_eval(INTERNAL_FUNCTION_PARAMETERS, int type) /* {{{ */
 	dom_object *nodeobj;
 	char *expr;
 	xmlDoc *docp = NULL;
-	xmlNsPtr *ns;
+	xmlNsPtr *ns = NULL;
+	zend_bool register_node_ns = 1;
 
-	if (zend_parse_method_parameters(ZEND_NUM_ARGS() TSRMLS_CC, getThis(), "Os|O", &id, dom_xpath_class_entry, &expr, &expr_len, &context, dom_node_class_entry) == FAILURE) {
+	if (zend_parse_method_parameters(ZEND_NUM_ARGS() TSRMLS_CC, getThis(), "Os|O!b", &id, dom_xpath_class_entry, &expr, &expr_len, &context, dom_node_class_entry, &register_node_ns) == FAILURE) {
 		return;
 	}
 
@@ -420,13 +423,15 @@ static void php_xpath_eval(INTERNAL_FUNCTION_PARAMETERS, int type) /* {{{ */
 
 	ctxp->node = nodep;
 
-	/* Register namespaces in the node */
-	ns = xmlGetNsList(docp, nodep);
+	if (register_node_ns) {
+		/* Register namespaces in the node */
+		ns = xmlGetNsList(docp, nodep);
 
-    if (ns != NULL) {
-        while (ns[nsnbr] != NULL)
-	    nsnbr++;
-    }
+		if (ns != NULL) {
+			while (ns[nsnbr] != NULL)
+			nsnbr++;
+		}
+	}
 
 
     ctxp->namespaces = ns;
@@ -518,14 +523,14 @@ static void php_xpath_eval(INTERNAL_FUNCTION_PARAMETERS, int type) /* {{{ */
 }
 /* }}} */
 
-/* {{{ proto DOMNodeList dom_xpath_query(string expr [,DOMNode context]); */
+/* {{{ proto DOMNodeList dom_xpath_query(string expr [,DOMNode context [, boolean registerNodeNS]]); */
 PHP_FUNCTION(dom_xpath_query)
 {
 	php_xpath_eval(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_DOM_XPATH_QUERY);
 }
 /* }}} end dom_xpath_query */
 
-/* {{{ proto mixed dom_xpath_evaluate(string expr [,DOMNode context]); */
+/* {{{ proto mixed dom_xpath_evaluate(string expr [,DOMNode context [, boolean registerNodeNS]]); */
 PHP_FUNCTION(dom_xpath_evaluate)
 {
 	php_xpath_eval(INTERNAL_FUNCTION_PARAM_PASSTHRU, PHP_DOM_XPATH_EVALUATE);