尽管配置文件中的凭据正确，但建立数据库连接wordpress时出错

Question

I'm getting Error establishing a database connection error whenever I load my HomePage ie index.php.

I have created a new test.php file with the same credentials as wp-config.php file to check the credentials and it works fine. I get Connected successfully message.

But when I run index.php file I get

Error establishing a database connection.

What could cause this error?

Test.php file

    <?php

    $link = mysqli_connect('localhost', 'username', 'password', 'dbname');

    if (!$link) {
    die('Could not connect: ' . mysql_error());
    }

    echo 'Connected successfully';

    mysql_close($link);

    ?>

Answer 1

Remove all above connection code from test.php file.
just use in beginning of file & it will give you connectivity from the config file. its wordpress's default functionality.

Answer 2

The problem was with one of my plugins. I had to remove the plugin to make it work properly.