Deprecate SoapClient ssl_method option

Instead use ssl stream context options instead. The direct
equivalent would be crypto_method, but min_proto_version /
max_proto_version are recommended instead.

Part of https://wiki.php.net/rfc/deprecations_php_8_1.

UPGRADING

@@ -406,6 +406,13 @@ PHP 8.1 UPGRADE NOTES
   . The PDO::FETCH_SERIALIZE mode has been deprecated.
     RFC: https://wiki.php.net/rfc/phase_out_serializable
 
+- SOAP:
+  . The ssl_method option for the SoapClient constructor has been deprecated in
+    favor of ssl stream context options. The direct equivalent would be
+    crypto_method, but min_proto_version/max_proto_version are recommended
+    instead.
+    RFC: https://wiki.php.net/rfc/deprecations_php_8_1
+
 - Standard:
   . Calling key(), current(), next(), prev(), reset(), or end() on objects
     is deprecated. Instead cast the object to array first, or make use of

ext/soap/soap.c

@@ -2127,6 +2127,9 @@ PHP_METHOD(SoapClient, __construct)
 		if ((tmp = zend_hash_str_find(ht, "ssl_method", sizeof("ssl_method")-1)) != NULL &&
 			Z_TYPE_P(tmp) == IS_LONG) {
 			add_property_long(this_ptr, "_ssl_method", Z_LVAL_P(tmp));
+			php_error_docref(NULL, E_DEPRECATED,
+				"The \"ssl_method\" option is deprecated. "
+				"Use \"ssl\" stream context options instead");
 		}
 	} else if (!wsdl) {
 		php_error_docref(NULL, E_ERROR, "'location' and 'uri' options are required in nonWSDL mode");

ext/soap/tests/ssl_method_deprecation.phpt

@@ -0,0 +1,16 @@
+--TEST--
+ssl_method option is deprecated
+--EXTENSIONS--
+soap
+--FILE--
+<?php
+
+new SoapClient(null, [
+    'location' => 'foo',
+    'uri' => 'bar',
+    'ssl_method' => SOAP_SSL_METHOD_TLS,
+]);
+
+?>
+--EXPECTF--
+Deprecated: SoapClient::__construct(): The "ssl_method" option is deprecated. Use "ssl" stream context options instead in %s on line %d