you have the wrong username / password to use the mysql connection.

You must replace "database usernam" etc. with your own data.

This error appears when you try to access an array value and the key is not within the associative array.

Example:

$test = array ("foo" => "bar", "tricky" => "code");

echo $test['foo']; => foo , all fine

echo $test['lanugages'] => error, because there is no key "languages"

No idea. Is your php code executed correctly? Sure there is no typo anywhere?

You can´t use function return values directly as an array. This is your code (an example):

$str = explode( "-", $frm['CUSTOM1'] )[1];
$id = explode( "-", $frm['CUSTOM1'] )[0];

You must save the return value of explode in a variable before you use it. Change your code to something like:

$arrTmp = explode( "-", $frm['CUSTOM1'] );
$str = $arrTmp[1];
$id = $arrTmp[0];

HTH

This could mean you have a problem to set up a mysql connection. Are you sure your username and password are correct?

Try to upload an .htaccess file in your document root like this:

php_admin_flag register_globals on

Sry, I am not a wordpress expert.

I can only tell you the function post_class is missing for some reason...

Please post your full error message.

In your file "database.php" some code is executed to connect to a database.

The given username/password in this code do not match the mysql server (you gave wrong credentials) and therefore no connection is established.

Ask your mysql-administrator or look for some typos in your username/password

your php code calls a function which does not exists. It´s name is "validip". Open all your php files and look for "function validip(", perhaps you just have misspelled it and it should be "valid_ip". Or you have to include a php file, in which the function is defined.