diff -c -r php-5.1.6-orig/ext/dom/documenttype.c php-5.1.6/ext/dom/documenttype.c
*** php-5.1.6-orig/ext/dom/documenttype.c	2013-11-05 09:51:02.000000000 +0900
--- php-5.1.6/ext/dom/documenttype.c	2013-11-05 09:52:33.000000000 +0900
***************
*** 216,222 ****
--- 216,226 ----
  		if (buff != NULL) {
  			xmlNodeDumpOutput (buff, NULL, (xmlNodePtr) intsubset, 0, 0, NULL);
  			xmlOutputBufferFlush(buff);
+ #ifdef LIBXML2_NEW_BUFFER
+ 			strintsubset = xmlStrndup(xmlOutputBufferGetContent(buff), xmlOutputBufferGetSize(buff));
+ #else
  			strintsubset = xmlStrndup(buff->buffer->content, buff->buffer->use);
+ #endif
  			(void)xmlOutputBufferClose(buff);
  			ZVAL_STRING(*retval, (char *) strintsubset, 1);
  			return SUCCESS;
Only in php-5.1.6/ext/dom: documenttype.c~
diff -c -r php-5.1.6-orig/ext/simplexml/simplexml.c php-5.1.6/ext/simplexml/simplexml.c
*** php-5.1.6-orig/ext/simplexml/simplexml.c	2013-11-05 09:51:06.000000000 +0900
--- php-5.1.6/ext/simplexml/simplexml.c	2013-11-05 09:53:24.000000000 +0900
***************
*** 1220,1226 ****
--- 1220,1230 ----
  
  			xmlNodeDumpOutput(outbuf, (xmlDocPtr) sxe->document->ptr, node, 0, 1, ((xmlDocPtr) sxe->document->ptr)->encoding);
  			xmlOutputBufferFlush(outbuf);
+ #ifdef LIBXML2_NEW_BUFFER
+ 			strval = xmlStrndup(xmlOutputBufferGetContent(outbuf), xmlOutputBufferGetSize(outbuf));
+ #else
  			strval = xmlStrndup(outbuf->buffer->content, outbuf->buffer->use);
+ #endif
  			xmlOutputBufferClose(outbuf);
  		}
  
Only in php-5.1.6/ext/simplexml: simplexml.c~