How do I read values (PHP defined constants) from wp-config.php?

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I need to get username, password etc from the wp-config file to connect to a custom PDO database.

Currently I have another file where I have this info, but I would like to only use the wp-config.

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So how can I read the different properties of wp-config?

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7 comments

  1. I have even defined my own constants in in wp-config.php and managed to retrieve them in theme without any includes.

    wp-config.php

    define('DEFAULT_ACCESS', 'employee');

    functions.php

    echo "DEFAULT_ACCESS :".DEFAULT_ACCESS;

    outputs DEFAULT_ACCESS :employee

  2. Here’s some same code. 

    // ...Call the database connection settings
require( path to /wp-config.php );

// ...Connect to WP database
$dbc = mysql_connect(DB_HOST, DB_USER, DB_PASSWORD);
if ( !$dbc ) {
    die( 'Not Connected: ' . mysql_error());
}
// Select the database
$db = mysql_select_db(DB_NAME);
if (!$db) {
    echo "There is no database: " . $db;
}

// ...Formulate the query
$query = "
    SELECT *
    FROM `wp_posts`
    WHERE `post_status` = 'publish'
    AND `post_password` = ''
    AND `post_type` = 'post'
    ";

// ...Perform the query
$result = mysql_query( $query );

// ...Check results of the query and terminate the script if invalid results
if ( !$result ) {
    $message = '<p>Invalid query.</p>' . "n";
    $message .= '<p>Whole query: ' . $query ."</p> n";
    die ( $message );
}

// Init a variable for the number of rows of results
$num_rows = mysql_num_rows( $result );

// Print the number of posts
echo "$num_rows Posts";

// Free the resources associated with the result set
if ( $result ) {
    mysql_free_result( $result );
    mysql_close();
}

  3. I would just include the file then I would have access to the variable in it varibales. 

    <?php
  require_once('wp-config.php');
  echo DB_NAME;
?>

    This is assuming you’re on the same server and you can access wp-config.php through the file system.

    If you’re doing this for a plugin, these values are already available. You won’t need to include the file again.

  5. Here is a function to read all WP DB defines:

    function get_wordpress_data() {
    $content = @file_get_contents( '../wp-config.php' );

    if( ! $content ) {
        return false;
    }

    $params = [
        'db_name' => "/define.+?'DB_NAME'.+?'(.*?)'.+/",
        'db_user' => "/define.+?'DB_USER'.+?'(.*?)'.+/",
        'db_password' => "/define.+?'DB_PASSWORD'.+?'(.*?)'.+/",
        'db_host' => "/define.+?'DB_HOST'.+?'(.*?)'.+/",
        'table_prefix' => "/\$table_prefix.+?'(.+?)'.+/",
    ];

    $return = [];

    foreach( $params as $key => $value ) {

        $found = preg_match_all( $value, $content, $result );

        if( $found ) {
            $return[ $key ] = $result[ 1 ][ 0 ];
        } else {
            $return[ $key ] = false;
        }

    }

    return $return;
}

    this returns an array like this:

    array (size=5)
  'db_name' => string '.........'
  'db_user' => string '.........'
  'db_password' => string '.........'
  'db_host' => string 'localhost'
  'table_prefix' => string 'wp_'

  6. If you want to connect to DB, for current versions of PHP, using mysqli extention is recommended (mysql extention is going to deprecate):

    require_once ("../wp-config.php"); // path to wp-config depends on your file locatoin
$mysqli = new mysqli(DB_HOST, DB_USER, DB_PASSWORD, DB_NAME);
if ($mysqli->connect_errno) {
    echo "Failed to connect to MySQL: (" . $mysqli->connect_errno . ") " . $mysqli->connect_error;
}