From c625d917a2f80d50f0690c5c45f0e9f832a7e223 Mon Sep 17 00:00:00 2001
From: SpencerMalone <malone.spencer@gmail.com>
Date: Sun, 12 Oct 2025 12:04:24 -0700
Subject: [PATCH] Fix not thread safe xmlSchemaParse calls in ZTS builds by
 calling xmlSchemaInitTypes during MINIT. See:
 https://gitlab.gnome.org/GNOME/libxml2/-/issues/930

---
 ext/libxml/libxml.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/ext/libxml/libxml.c b/ext/libxml/libxml.c
index eecbca4ed8908..6864b25c87908 100644
--- a/ext/libxml/libxml.c
+++ b/ext/libxml/libxml.c
@@ -39,6 +39,7 @@
 #ifdef LIBXML_SCHEMAS_ENABLED
 #include <libxml/relaxng.h>
 #include <libxml/xmlschemas.h>
+#include <libxml/xmlschemastypes.h>
 #endif
 
 #include "php_libxml.h"
@@ -933,7 +934,11 @@ PHP_LIBXML_API void php_libxml_initialize(void)
 	if (!_php_libxml_initialized) {
 		/* we should be the only one's to ever init!! */
 		ZEND_IGNORE_LEAKS_BEGIN();
+
 		xmlInitParser();
+#ifdef LIBXML_SCHEMAS_ENABLED
+		xmlSchemaInitTypes();
+#endif
 		ZEND_IGNORE_LEAKS_END();
 
 		_php_libxml_default_entity_loader = xmlGetExternalEntityLoader();