--- a/all_db.php        2020-11-07 09:09:12.000000000 +0300
+++ b/all_db.php        2021-03-08 17:44:57.760262808 +0300
@@ -199,7 +199,7 @@
                echo "\t\t<td class=\"data1\">\n";
                echo "\t\t\t<select name=\"formEncoding\">\n";
                echo "\t\t\t\t<option value=\"\"></option>\n";
-               while (list ($key) = each ($data->codemap)) {
+               foreach ($data->codemap as $key => $value) {
                    echo "\t\t\t\t<option value=\"", htmlspecialchars($key), "\"",
                                ($key == $_POST['formEncoding']) ? ' selected="selected"' : '', ">",
                                $misc->printVal($key), "</option>\n";
--- a/libraries/adodb/drivers/adodb-postgres64.inc.php  2020-11-07 09:09:12.000000000 +0300
+++ b/libraries/adodb/drivers/adodb-postgres64.inc.php  2021-03-08 08:08:31.886314599 +0300
@@ -122,6 +122,11 @@
        // changes the metaColumnsSQL, adds columns: attnum[6]
        }

+       function __construct()
+       {
+       // changes the metaColumnsSQL, adds columns: attnum[6]
+       }
+
        function ServerInfo()
        {
                if (isset($this->version)) return $this->version;

https://github.com/phppgadmin/phppgadmin/issues/119

旧版本的PostgreSQL不被支持。 请更新到版本 或更高版本。
vim classes/database/Connection.php
       switch (substr($version,0,2)) {
添加case '16':

登录失败的解决办法：
sudo vim /var/lib/pgsql/data/pg_hba.conf
# "local" is for Unix domain socket connections only
local   all             all                                     md5 #peer
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5 #ident
# IPv6 local connections:
host    all             all             ::1/128                 md5 #ident
全部改md5。

设置postgres用户密码的SQL语句：
ALTER USER postgres PASSWORD '密码';