Fix mysqli tests wrt. MySQL 8.0.28

As of MySQL 8.0.28, `utf8mb3` charset is reported by the server, but
mysqlnd doesn't support it yet.  As a stop-gap measure, we ignore that
charset for now.

Closes GH-8480.

Author: cmb69

ext/mysqli/tests/mysqli_character_set.phpt

@@ -44,7 +44,8 @@ if (!function_exists('mysqli_set_charset')) {
         /* The server currently 17.07.2007 can't handle data sent in ucs2 */
         /* The server currently 16.08.2010 can't handle data sent in utf16 and utf32 */
         /* The server currently 02.09.2011 can't handle data sent in utf16le */
-        if ($charset['Charset'] == 'ucs2' || $charset['Charset'] == 'utf16' || $charset['Charset'] == 'utf32' || 'utf16le' == $charset['Charset']) {
+        /* As of MySQL 8.0.28, `SHOW CHARACTER SET` contains utf8mb3, but that is not yet supported by mysqlnd */
+        if ($charset['Charset'] == 'ucs2' || $charset['Charset'] == 'utf16' || $charset['Charset'] == 'utf32' || 'utf16le' == $charset['Charset'] || 'utf8mb3' == $charset['Charset']) {
             continue;
         }
 

ext/mysqli/tests/mysqli_options.phpt

@@ -68,7 +68,8 @@ require_once('skipifconnectfailure.inc');
         $k = $charset['Charset'];
         /* The server currently 17.07.2007 can't handle data sent in ucs2 */
         /* The server currently 16.08.2010 can't handle data sent in utf16 and utf32 */
-        if ($charset['Charset'] == 'ucs2' || $charset['Charset'] == 'utf16' || $charset['Charset'] == 'utf32') {
+        /* As of MySQL 8.0.28, `SHOW CHARACTER SET` contains utf8mb3, but that is not yet supported by mysqlnd */
+        if ($charset['Charset'] == 'ucs2' || $charset['Charset'] == 'utf16' || $charset['Charset'] == 'utf32' || $charset['Charset'] == 'utf8mb3') {
             continue;
         }
         if (true !== mysqli_options($link, MYSQLI_SET_CHARSET_NAME, $charset['Charset'])) {

ext/mysqli/tests/mysqli_set_charset.phpt

@@ -85,7 +85,8 @@ if ((($res = mysqli_query($link, 'SHOW CHARACTER SET LIKE "latin1"', MYSQLI_STOR
         printf("[016] Cannot get list of character sets\n");
 
     while ($tmp = mysqli_fetch_assoc($res)) {
-        if ('ucs2' == $tmp['Charset'] || 'utf16' == $tmp['Charset'] || 'utf32' == $tmp['Charset'] || 'utf16le' == $tmp['Charset'])
+        /* As of MySQL 8.0.28, `SHOW CHARACTER SET` contains utf8mb3, but that is not yet supported by mysqlnd */
+        if ('ucs2' == $tmp['Charset'] || 'utf16' == $tmp['Charset'] || 'utf32' == $tmp['Charset'] || 'utf16le' == $tmp['Charset'] || 'utf8mb3' == $tmp['Charset'])
             continue;
 
         /* Uncomment to see where it hangs - var_dump($tmp); flush(); */