diff --git a/lib/phpxmlrpc/Encoder.php b/lib/phpxmlrpc/Encoder.php
index 7ad2adb06d0..2bee668b4fb 100644
--- a/lib/phpxmlrpc/Encoder.php
+++ b/lib/phpxmlrpc/Encoder.php
@@ -303,14 +303,10 @@ class Encoder
             // The following code might be better for mb_string enabled installs, but makes the lib about 200% slower...
             //if (!is_valid_charset($valEncoding, array('UTF-8'))
             if (!in_array($valEncoding, array('UTF-8', 'US-ASCII')) && !XMLParser::hasEncoding($xmlVal)) {
-                if ($valEncoding == 'ISO-8859-1') {
-                    $xmlVal = utf8_encode($xmlVal);
+                if (function_exists('mb_convert_encoding')) {
+                    $xmlVal = mb_convert_encoding($xmlVal, 'UTF-8', $valEncoding);
                 } else {
-                    if (extension_loaded('mbstring')) {
-                        $xmlVal = mb_convert_encoding($xmlVal, 'UTF-8', $valEncoding);
-                    } else {
-                        $this->getLogger()->errorLog('XML-RPC: ' . __METHOD__ . ': invalid charset encoding of xml text: ' . $valEncoding);
-                    }
+                    $this->getLogger()->errorLog('XML-RPC: ' . __METHOD__ . ': invalid charset encoding of xml text: ' . $valEncoding);
                 }
             }
         }
diff --git a/lib/phpxmlrpc/Helper/Charset.php b/lib/phpxmlrpc/Helper/Charset.php
index 5fa54225a36..fd7cf9eaf48 100644
--- a/lib/phpxmlrpc/Helper/Charset.php
+++ b/lib/phpxmlrpc/Helper/Charset.php
@@ -235,7 +235,9 @@ class Charset
 
             case 'ISO-8859-1_UTF-8':
                 $escapedData = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', '&apos;', '&lt;', '&gt;'), $data);
-                $escapedData = utf8_encode($escapedData);
+                if (function_exists('mb_convert_encoding')) {
+                    $escapedData = mb_convert_encoding($escapedData, 'UTF-8', 'ISO-8859-1');
+                }
                 break;
 
             case 'ISO-8859-1_US-ASCII':
@@ -256,7 +258,7 @@ class Charset
                 $escapedData = str_replace(array('&', '"', "'", '<', '>'), array('&amp;', '&quot;', '&apos;', '&lt;', '&gt;'), $data);
                 /// @todo we could use real UTF8 chars here instead of xml entities... (note that utf_8 encode all alone will NOT convert them)
                 $escapedData = str_replace($this->xml_cp1252_Entities['in'], $this->xml_cp1252_Entities['out'], $escapedData);
-                $escapedData = utf8_encode($escapedData);
+                $escapedData =  mb_convert_encoding($escapedData, 'UTF-8', 'ISO-8859-1');
                 break;
             case 'CP1252_ISO-8859-1':
                 $this->buildConversionTable('xml_cp1252_Entities');
diff --git a/lib/phpxmlrpc/Request.php b/lib/phpxmlrpc/Request.php
index 9841c015031..0e4d1b87b80 100644
--- a/lib/phpxmlrpc/Request.php
+++ b/lib/phpxmlrpc/Request.php
@@ -304,15 +304,10 @@ class Request
             // The following code might be better for mb_string enabled installs, but makes the lib about 200% slower...
             //if (!is_valid_charset($respEncoding, array('UTF-8')))
             if (!in_array($respEncoding, array('UTF-8', 'US-ASCII')) && !XMLParser::hasEncoding($data)) {
-                if ($respEncoding == 'ISO-8859-1') {
-                    $data = utf8_encode($data);
+                if (function_exists('mb_convert_encoding')) {
+                    $data = mb_convert_encoding($data, 'UTF-8', $respEncoding);
                 } else {
-
-                    if (extension_loaded('mbstring')) {
-                        $data = mb_convert_encoding($data, 'UTF-8', $respEncoding);
-                    } else {
-                        $this->getLogger()->errorLog('XML-RPC: ' . __METHOD__ . ': invalid charset encoding of received response: ' . $respEncoding);
-                    }
+                    $this->getLogger()->errorLog('XML-RPC: ' . __METHOD__ . ': unsupported charset encoding of received response: ' . $respEncoding);
                 }
             }
         }
diff --git a/lib/phpxmlrpc/Server.php b/lib/phpxmlrpc/Server.php
index 1cc965f3d32..40847569e9f 100644
--- a/lib/phpxmlrpc/Server.php
+++ b/lib/phpxmlrpc/Server.php
@@ -558,14 +558,10 @@ class Server
             // makes the lib about 200% slower...
             //if (!is_valid_charset($reqEncoding, array('UTF-8')))
             if (!in_array($reqEncoding, array('UTF-8', 'US-ASCII')) && !XMLParser::hasEncoding($data)) {
-                if ($reqEncoding == 'ISO-8859-1') {
-                    $data = utf8_encode($data);
+                if (function_exists('mb_convert_encoding')) {
+                    $data = mb_convert_encoding($data, 'UTF-8', $reqEncoding);
                 } else {
-                    if (extension_loaded('mbstring')) {
-                        $data = mb_convert_encoding($data, 'UTF-8', $reqEncoding);
-                    } else {
-                        $this->getLogger()->errorLog('XML-RPC: ' . __METHOD__ . ': invalid charset encoding of received request: ' . $reqEncoding);
-                    }
+                    $this->getLogger()->errorLog('XML-RPC: ' . __METHOD__ . ': unsupported charset encoding of received request: ' . $reqEncoding);
                 }
             }
         }
diff --git a/lib/phpxmlrpc/readme_moodle.txt b/lib/phpxmlrpc/readme_moodle.txt
index ae13fbaaebe..326c3d6b768 100644
--- a/lib/phpxmlrpc/readme_moodle.txt
+++ b/lib/phpxmlrpc/readme_moodle.txt
@@ -20,3 +20,8 @@ Current version imported: 4.8.1 (c74cc31)
 
 Local changes:
  * readme_moodle.txt - this file ;-)
+
+ * 2023-01-31 lib/phpxmlrpc/* has minor changes for PHP 8.2 compatibility. See MDL-76412 for more details.
+    Since version 4.9.5, phpxmlrpc already has the fix, so if someone executing the upgrading version and
+    it has the patch, please ignore this note.
+ * 2023-01-31 Applied patch https://github.com/gggeek/phpxmlrpc/pull/110. See MDL-76412 for more details.
\ No newline at end of file