Deprecate libxml_disable_entity_loader()

This method was used to protect code against XXE processing attacks.
Since PHP now requires libxml >= 2.9.0 external entity loading no longer
needs to be disabled to prevent these attacks. It is disabled by default.
Also, the method has an unwanted side effect that causes a lot of
confusion: Parsing XML data from resources like files is no longer possible.

Author: Dik Takken

ext/libxml/libxml_arginfo.h

@@ -42,7 +42,7 @@ static const zend_function_entry ext_functions[] = {
 	ZEND_FE(libxml_get_last_error, arginfo_libxml_get_last_error)
 	ZEND_FE(libxml_get_errors, arginfo_libxml_get_errors)
 	ZEND_FE(libxml_clear_errors, arginfo_libxml_clear_errors)
-	ZEND_FE(libxml_disable_entity_loader, arginfo_libxml_disable_entity_loader)
+	ZEND_DEP_FE(libxml_disable_entity_loader, arginfo_libxml_disable_entity_loader)
 	ZEND_FE(libxml_set_external_entity_loader, arginfo_libxml_set_external_entity_loader)
 	ZEND_FE_END
 };

ext/libxml/tests/libxml_disable_entity_loader.phpt

@@ -33,6 +33,8 @@ echo "Done\n";
 ?>
 --EXPECTF--
 bool(true)
+
+Deprecated: Function libxml_disable_entity_loader() is deprecated in %s on line %d
 bool(false)
 
 Warning: DOMDocument::loadXML(): I/O warning : failed to load external entity "%s" in %s on line %d