Patch for libxml 2.12 support for PHP 5.6
--- a/ext/dom/document.c
+++ b/ext/dom/document.c
@@ -27,6 +27,7 @@
 #if HAVE_LIBXML && HAVE_DOM
 #include "php_dom.h"
 #include <libxml/SAX.h>
+#include <libxml/xmlsave.h>
 #ifdef LIBXML_SCHEMAS_ENABLED
 #include <libxml/relaxng.h>
 #include <libxml/xmlschemas.h>
--- a/ext/libxml/php_libxml.h
+++ b/ext/libxml/php_libxml.h
@@ -36,6 +36,7 @@ extern zend_module_entry libxml_module_entry;
 
 #include "ext/standard/php_smart_str.h"
 #include <libxml/tree.h>
+#include <libxml/parser.h>
 
 #define LIBXML_SAVE_NOEMPTYTAG 1<<2
 
--- a/ext/libxml/libxml.c
+++ b/ext/libxml/libxml.c
@@ -470,7 +470,11 @@
 	return 1;
 }
 
-static void _php_list_set_error_structure(xmlErrorPtr error, const char *msg)
+#if LIBXML_VERSION >= 21200
+static void _php_list_set_error_structure(const xmlError *error, const char *msg)
+#else
+static void _php_list_set_error_structure(xmlError *error, const char *msg)
+#endif
 {
 	xmlError error_copy;
 	int ret;
@@ -728,7 +732,11 @@
 	va_end(args);
 }
 
+#if LIBXML_VERSION >= 21200
+PHP_LIBXML_API void php_libxml_structured_error_handler(void *userData, const xmlError *error)
+#else
 PHP_LIBXML_API void php_libxml_structured_error_handler(void *userData, xmlErrorPtr error)
+#endif
 {
 	_php_list_set_error_structure(error, NULL);
 
@@ -1001,9 +1009,7 @@
    Retrieve last error from libxml */
 static PHP_FUNCTION(libxml_get_last_error)
 {
-	xmlErrorPtr error;
-
-	error = xmlGetLastError();
+	const xmlError *error = xmlGetLastError();
 	
 	if (error) {
 		object_init_ex(return_value, libxmlerror_class_entry);
--- a/ext/soap/php_sdl.c
+++ b/ext/soap/php_sdl.c
@@ -334,7 +334,7 @@ static void load_wsdl_ex(zval *this_ptr, char *struri, sdlCtx *ctx, int include)
 	sdl_restore_uri_credentials(ctx TSRMLS_CC);
 
 	if (!wsdl) {
-		xmlErrorPtr xmlErrorPtr = xmlGetLastError();
+		const xmlError *xmlErrorPtr = xmlGetLastError();
 
 		if (xmlErrorPtr) {
 			soap_error2(E_ERROR, "Parsing WSDL: Couldn't load from '%s' : %s", struri, xmlErrorPtr->message);