add global init/shutdown functions for libxml. this is required as

shutdown is not safe to call multiple times, and to make streams work
correctly some init stuff has to happen in a specific order

ext/dom/php_dom.c

@@ -32,6 +32,7 @@
 #include "dom_properties.h"
 
 #include "ext/standard/info.h"
+#include "ext/libxml/php_libxml.h"
 #define PHP_XPATH 1
 #define PHP_XPTR 2
 
@@ -702,7 +703,7 @@ PHP_MINIT_FUNCTION(dom)
 	REGISTER_LONG_CONSTANT("DOM_INVALID_ACCESS_ERR",	INVALID_ACCESS_ERR,		CONST_CS | CONST_PERSISTENT);
 	REGISTER_LONG_CONSTANT("DOM_VALIDATION_ERR",		VALIDATION_ERR,			CONST_CS | CONST_PERSISTENT);
 
-	xmlInitParser();
+	php_libxml_initialize();
 
 	return SUCCESS;
 }
@@ -723,6 +724,10 @@ PHP_MINFO_FUNCTION(dom)
 #endif
 #if defined(LIBXML_XPTR_ENABLED)
 	php_info_print_table_row(2, "XPointer Support", "enabled");
+#endif
+#ifdef LIBXML_SCHEMAS_ENABLED
+	php_info_print_table_row(2, "Schema Support", "enabled");
+	php_info_print_table_row(2, "RelaxNG Support", "enabled");
 #endif
 	php_info_print_table_end();
 }
@@ -730,7 +735,7 @@ PHP_MINFO_FUNCTION(dom)
 
 PHP_MSHUTDOWN_FUNCTION(dom)
 {
-	xmlCleanupParser();
+	php_libxml_shutdown();
 
 	zend_hash_destroy(&dom_domstringlist_prop_handlers);
 	zend_hash_destroy(&dom_namelist_prop_handlers);

ext/libxml/libxml.c

@@ -42,6 +42,9 @@
 
 #include "php_libxml.h"
 
+/* a true global for initialization */
+int _php_libxml_initialized = 0;
+
 #ifdef ZTS
 int libxml_globals_id;
 #else
@@ -101,8 +104,7 @@ static void php_libxml_init_globals(php_libxml_globals *libxml_globals_p TSRMLS_
 int php_libxml_streams_IO_match_wrapper(const char *filename)
 {
 	TSRMLS_FETCH();
-	return php_stream_locate_url_wrapper(filename, NULL, STREAM_LOCATE_WRAPPERS_ONLY TSRMLS_CC) ? 1 : 0;
-
+	return php_stream_locate_url_wrapper(filename, NULL, 0 TSRMLS_CC) ? 1 : 0;
 }
 
 void *php_libxml_streams_IO_open_wrapper(const char *filename)
@@ -134,31 +136,48 @@ int php_libxml_streams_IO_close(void *context)
 	return php_stream_close((php_stream*)context);
 }
 
+PHP_LIBXML_API void php_libxml_initialize() {
+	if (!_php_libxml_initialized) {
+		/* we should be the only one's to ever init!! */
+		xmlInitParser();
+
+		/* Enable php stream/wrapper support for libxml 
+		   we only use php streams, so we do not enable
+		   the default io handlers in libxml.
+		*/
+		xmlRegisterInputCallbacks(
+			php_libxml_streams_IO_match_wrapper, 
+			php_libxml_streams_IO_open_wrapper,
+			php_libxml_streams_IO_read, 
+			php_libxml_streams_IO_close);
+
+		xmlRegisterOutputCallbacks(
+			php_libxml_streams_IO_match_wrapper, 
+			php_libxml_streams_IO_open_wrapper,
+			php_libxml_streams_IO_write, 
+			php_libxml_streams_IO_close);
+
+		_php_libxml_initialized = 1;
+	}
+}
+
+PHP_LIBXML_API void php_libxml_shutdown() {
+	if (_php_libxml_initialized) {
+		xmlCleanupParser();
+		_php_libxml_initialized = 0;
+	}
+}
+
 PHP_MINIT_FUNCTION(libxml)
 {
-	/* Enable php stream/wrapper support for libxml 
-	   we only use php streams, so we disable the libxml builtin
-	   io support.
-	*/
-	xmlCleanupInputCallbacks();
-	xmlRegisterInputCallbacks(
-		php_libxml_streams_IO_match_wrapper, 
-		php_libxml_streams_IO_open_wrapper,
-		php_libxml_streams_IO_read, 
-		php_libxml_streams_IO_close);
-
-	xmlCleanupOutputCallbacks();
-	xmlRegisterOutputCallbacks(
-		php_libxml_streams_IO_match_wrapper, 
-		php_libxml_streams_IO_open_wrapper,
-		php_libxml_streams_IO_write, 
-		php_libxml_streams_IO_close);
-	
+	php_libxml_initialize();
+
 #ifdef ZTS
 	ts_allocate_id(&libxml_globals_id, sizeof(php_libxml_globals), (ts_allocate_ctor) php_libxml_init_globals, NULL);
 #else
 	LIBXML(stream_context) = NULL;
 #endif
+
 	return SUCCESS;
 }
 
@@ -171,6 +190,7 @@ PHP_RINIT_FUNCTION(libxml)
 
 PHP_MSHUTDOWN_FUNCTION(libxml)
 {
+	php_libxml_shutdown();
 	return SUCCESS;
 }
 

ext/libxml/php_libxml.h

@@ -56,6 +56,9 @@ PHP_FUNCTION(libxml_set_streams_context);
 #define LIBXML(v) (libxml_globals.v)
 #endif
 
+PHP_LIBXML_API void php_libxml_initialize();
+PHP_LIBXML_API void php_libxml_shutdown();
+
 #endif /* PHP_LIBXML_H */
 
 /*

ext/simplexml/simplexml.c

@@ -28,6 +28,7 @@
 #include "php_ini.h"
 #include "ext/standard/info.h"
 #include "php_simplexml.h"
+#include "ext/libxml/php_libxml.h"
 
 zend_class_entry *sxe_class_entry;
 
@@ -1037,7 +1038,7 @@ PHP_MINIT_FUNCTION(simplexml)
 	sxe.create_object = sxe_object_new;
 	sxe_class_entry = zend_register_internal_class(&sxe TSRMLS_CC);
 
-	xmlInitParser();
+	php_libxml_initialize();
 
 	return SUCCESS;
 }
@@ -1047,7 +1048,7 @@ PHP_MINIT_FUNCTION(simplexml)
  */
 PHP_MSHUTDOWN_FUNCTION(simplexml)
 {
-	xmlCleanupParser();
+	php_libxml_shutdown();
 
 	return SUCCESS;
 }

ext/xml/xml.c

@@ -37,6 +37,9 @@
 
 #include "php_xml.h"
 # include "ext/standard/head.h"
+#ifdef LIBXML_EXPAT_COMPAT
+#include "ext/libxml/php_libxml.h"
+#endif
 
 /* Short-term TODO list:
  * - Implement XML_ExternalEntityParserCreate()
@@ -238,7 +241,7 @@ PHP_MINIT_FUNCTION(xml)
 	php_xml_mem_hdlrs.free_fcn = php_xml_free_wrapper;
 
 #ifdef LIBXML_EXPAT_COMPAT
-	xmlInitParser();
+	php_libxml_initialize();
 #endif
 	return SUCCESS;
 }
@@ -253,7 +256,7 @@ PHP_RINIT_FUNCTION(xml)
 PHP_MSHUTDOWN_FUNCTION(xml)
 {
 #ifdef LIBXML_EXPAT_COMPAT
-	xmlCleanupParser();
+	php_libxml_shutdown();
 #endif
 	return SUCCESS;
 }