If you are searching this then likely the PHP (and MySQL version) of your hosting got updated but your WordPress is still running a very old version say like 4.x or you need to get your very old codes running.
The good part is the site can be made up very easily and in a short time. The beauty of PHP (python, java, .Net also) is backward compatibility is very good so in most cases very little code changes are required.
- First check if the code still has “mysql_” instead of “mysqli_“. If that is the case – change all “mysql_” to “mysqli_“.
- Another change required in this context is mysqli_select_db it now takes two parameters – mysqli_select_db(connection, name)
And mysqli_query also needs the mysql connection – mysqli_query(connection, query, resultmode) - Next check your error log for errors.
- One of the most common ones are variable errors like Illegal string offset ‘output_key’ in /path/to/file
This can be solved by changing
$items[$k]->$args[‘output_key’]
to
$items[$k]->{$args[‘output_key’]}
- Another common error is Illegal string offset ‘user_login’. This error causes the admin to not open. This can be solved by adding the following in user.php just before $user
- One of the most common ones are variable errors like Illegal string offset ‘output_key’ in /path/to/file
if(isset($_POST)){ $credentials = array( 'user_login' => isset($_POST['log']) ? $_POST['log'] : '', 'user_password' => isset($_POST['pwd']) ? $_POST['pwd'] :'', ); }