Fixed bug #41175 (addAttribute() fails to add an attribute with an empty

NEWS

@@ -4,6 +4,8 @@ PHP                                                                        NEWS
 - Fixed commandline handling fro CLI and CGI. (Marcus, Johannes)
 - Upgraded SQLite 3 to version 3.3.16 (Ilia)
 - Updated timezone database to version 2007.5. (Derick)
+- Fixed bug #41175 (addAttribute() fails to add an attribute with an empty
+  value). (Ilia)
 - Fixed bug #41159 (mysql_pconnect() hash does not account for connect
   flags). (Ilia)
 - Fixed bug #41121 (range() overflow handling for large numbers on 32bit

ext/simplexml/simplexml.c

@@ -1542,7 +1542,7 @@ SXE_METHOD(addAttribute)
 		return;
 	}
 
-	if (qname_len == 0 || value_len == 0) {
+	if (qname_len == 0) {
 		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Attribute name and value are required");
 		return;
 	}

ext/simplexml/tests/bug41175.phpt

@@ -0,0 +1,16 @@
+--TEST--
+Bug #41175 (addAttribute() fails to add an attribute with an empty value)
+--FILE--
+<?php
+
+$xml = new SimpleXmlElement("<img></img>");
+$xml->addAttribute("src", "foo");
+$xml->addAttribute("alt", "");
+echo $xml->asXML();
+
+echo "Done\n";
+?>
+--EXPECT--	
+<?xml version="1.0"?>
+<img src="foo" alt=""/>
+Done