PHP cannot connect to MySQL // Connecting to 3.22, 3.23 & 4.0 servers is not supported

Can you post your PHP script that you use to connect

Please show us the complete error message, including the line numbers.  And show us the lines of PHP code.

And don't switch PHP back to Version 4.  PHP 5+ has been current for several years.

That's the only error message i get (with mysql_error)

That's the include code for all pages

<?php

$mysqlhost='xxx.xxx.xxx.xxx';
$mysqluser='frsdf.81';
$mysqlpwd='xxxxx'; 
$mysqldb='fwde';  

$connection = mysql_connect($mysqlhost, $mysqluser, $mysqlpwd) or die (mysql_error()); 

mysql_query("SET NAMES 'utf8'");
mysql_select_db($mysqldb, $connection) or die("Cannot connect database"); 

?>

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In thats the way I open the database table in the index.php:

$sql_estz = "SELECT * FROM estz WHERE E_ID=$E_ID";
$estz_query = mysql_query($sql_estz) or die("Error );

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It sounds like you have the MySQL driver leftover from PHP 4.4 because that's what causes that error message.  When you install PHP 5.xxx, it should COMPLETELY replace all of the code from PHP 4.4.  When I have upgraded PHP on my Windows machine, I rename the existing directory and put the new code in a different folder.  In addition,  you may have to go into your IIS setup and unclick 'Cache ISAPI applications' which is on the Home Directory tab under Configuration.  Then restart IIS at least once and maybe twice so it will read the new version of PHP.

Hi,

I changed to MySQLi and everything works great.
No more errors...

Maybe later I'll have a look on PDO - sounds interesting - but at the moment MySQLi solves the problem for me...

Thank you

If MySQLi works for you then stick with it. PDO is just an alternative - not necessarily better or worse (although I do like named parameters available in PDO)

You may also want to note the information here:
https://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_11177-PHP-MySQL-Deprecated-as-of-PHP-5-5-0.html#c100505

Best of luck, ~Ray