Redesign client_info and client_version in mysqli

UPGRADING

@@ -221,6 +221,10 @@ PHP 8.1 UPGRADE NOTES
   . The mysqli_driver::$driver_version property has been deprecated. The driver
     version is meaningless as it hasn't been updated in more than a decade. Use
     PHP_VERSION_ID instead.
+  . Calling mysqli::get_client_info in OO style or passing $mysqli argument to
+    mysqli_get_client_info() function has been deprecated. Use
+    mysqli_get_client_info() without any arguments to obtain the client
+    library version information.
 
 ========================================
 5. Changed Functions

ext/mysqli/mysqli.stub.php

@@ -136,6 +136,7 @@ public function get_charset() {}
     /**
      * @return string|null
      * @alias mysqli_get_client_info
+     * @deprecated 8.1.0
      */
     public function get_client_info() {}
 

ext/mysqli/mysqli_api.c

@@ -1327,6 +1327,10 @@ PHP_FUNCTION(mysqli_get_client_info)
 		if (zend_parse_parameters(ZEND_NUM_ARGS(), "|O!", &mysql_link, mysqli_link_class_entry) == FAILURE) {
 			RETURN_THROWS();
 		}
+
+		if (ZEND_NUM_ARGS()) {
+			php_error_docref(NULL, E_DEPRECATED, "Passing connection object as an argument is deprecated");
+		}
 	}
 
 	RETURN_STRING(mysql_get_client_info());

ext/mysqli/mysqli_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 56499df713b79c1e9efc19cf8be45aa98028172c */
+ * Stub hash: e65b3497e7783d55f3dfd4cd89be65094c59b1d3 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mysqli_affected_rows, 0, 1, MAY_BE_LONG|MAY_BE_STRING)
 	ZEND_ARG_OBJ_INFO(0, mysql, mysqli, 0)
@@ -938,7 +938,7 @@ static const zend_function_entry class_mysqli_methods[] = {
 	ZEND_ME_MAPPING(dump_debug_info, mysqli_dump_debug_info, arginfo_class_mysqli_dump_debug_info, ZEND_ACC_PUBLIC)
 	ZEND_ME_MAPPING(debug, mysqli_debug, arginfo_class_mysqli_debug, ZEND_ACC_PUBLIC)
 	ZEND_ME_MAPPING(get_charset, mysqli_get_charset, arginfo_class_mysqli_get_charset, ZEND_ACC_PUBLIC)
-	ZEND_ME_MAPPING(get_client_info, mysqli_get_client_info, arginfo_class_mysqli_get_client_info, ZEND_ACC_PUBLIC)
+	ZEND_ME_MAPPING(get_client_info, mysqli_get_client_info, arginfo_class_mysqli_get_client_info, ZEND_ACC_PUBLIC|ZEND_ACC_DEPRECATED)
 #if defined(MYSQLI_USE_MYSQLND)
 	ZEND_ME_MAPPING(get_connection_stats, mysqli_get_connection_stats, arginfo_class_mysqli_get_connection_stats, ZEND_ACC_PUBLIC)
 #endif

ext/mysqli/tests/bug36802.phpt

@@ -31,7 +31,7 @@ Bug #36802 (crashes with with mysqli_set_charset())
     }
 
     /* following operations should work */
-    $x[1] = ($mysql->client_version > 0);
+    $x[1] = ($mysql->error);
     $x[2] = $mysql->errno;
 
     $mysql->close();
@@ -43,7 +43,7 @@ mysqli object is not fully initialized
 mysqli object is not fully initialized
 array(2) {
   [1]=>
-  bool(true)
+  string(0) ""
   [2]=>
   int(0)
 }

ext/mysqli/tests/mysqli_get_info_deprecations.phpt

@@ -0,0 +1,31 @@
+--TEST--
+Deprecated messages for mysqli::get_client_info() method
+--SKIPIF--
+<?php
+require_once 'skipif.inc';
+require_once 'skipifconnectfailure.inc';
+?>
+--FILE--
+<?php
+require 'connect.inc';
+
+if (!$mysqli = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket)) {
+    printf("Cannot connect to the server using host=%s, user=%s, passwd=***, dbname=%s, port=%s, socket=%s\n",
+        $host, $user, $db, $port, $socket);
+    exit(1);
+}
+
+printf("client_info = '%s'\n", $mysqli->get_client_info());
+
+printf("client_info = '%s'\n", mysqli_get_client_info($mysqli));
+
+print "done!";
+?>
+--EXPECTF--
+
+Deprecated: Method mysqli::get_client_info() is deprecated in %s
+client_info = '%s'
+
+Deprecated: mysqli_get_client_info(): Passing connection object as an argument is deprecated in %s
+client_info = '%s'
+done!