如何获得WordPress站点的wp-config.php文件路径？

Question

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

I dunno wat is exact path ..

Any help is appreciated ..

Answer 1

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) );

Suggested reading:

• http://codex.wordpress.org/Class_Reference/wpdb

Answer 2

Querying the database in WordPress should be done through the global $wpdb variable. See the codex entry for that: http://codex.wordpress.org/Class_Reference/wpdb .

Answer 3

If you still want to avoid all the warnings to make good practices of coding, you can try this that include many paths where can find wp-config.php

if( !(include $_SERVER['DOCUMENT_ROOT'].'/wp-config.php') )
if( !(include 'wp-config.php') )
if( !(include '../../../wp-config.php') )
if( !(include '../../../../wp-config.php') )
if( !(include '../../../../../wp-config.php') )
    die('<H1>Can\'t include config.</H1>');

Notes: you can add lines with if( !(include 'my_custom_path/wp-config.php') )

you can't use wp_die() until wp-config be included, then use php function die()