how to get a file path of wp-config.php of wordpress site?

I am developing a plugin in which i need to include config and query the wordpress database on click ..My question is How to get url of wp-config.php dynamically ..I have used

include_once $_SERVER['DOCUMENT_ROOT'] . '/wp-config.php';

but i am getting error

include_once(): Failed opening /wp-config.php' for inclusion (include_path='.:/usr/share/php:/usr/share/pear')

and i have tried many options like

require_once ("../wp-config.php");

I dunno wat is exact path ..

Any help is appreciated ..


In short, you shouldn't be trying to include wp-config.php from your plugin. There are few if any good reasons you would ever take this approach. Purists would go as far as to say it should never be done.

A WordPress plugin already has the proper context to access the global $wpdb variable for querying. Take a look at this example:

global $wpdb;

$results = $wpdb->get_results( $wpdb->prepare("SELECT * FROM {$wpdb->prefix}your_table WHERE column = %s", $your_value) );

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