civicrm.config.php

<?php

/**
 * This function has been copied from DRUPAL_ROOT/includes/bootstrap.inc
 */

/**
 * Locate the appropriate configuration file.
 *
 * Try finding a matching configuration directory by stripping the
 * website's hostname from left to right and pathname from right to
 * left.  The first configuration file found will be used, the
 * remaining will ignored.  If no configuration file is found,
 * return a default value '$confdir/default'.
 *
 * Example for a fictitious site installed at
 * http://www.drupal.org/mysite/test/ the 'settings.php' is
 * searched in the following directories:
 *
 *  1. $confdir/www.drupal.org.mysite.test
 *  2. $confdir/drupal.org.mysite.test
 *  3. $confdir/org.mysite.test
 *
 *  4. $confdir/www.drupal.org.mysite
 *  5. $confdir/drupal.org.mysite
 *  6. $confdir/org.mysite
 *
 *  7. $confdir/www.drupal.org
 *  8. $confdir/drupal.org
 *  9. $confdir/org
 *
 * 10. $confdir/default
 *
 */

function civicrm_conf_init() {
    global $skipConfigError;

    static $conf = '';

    if ($conf) {
        return $conf;
    }

    /**
     * Quick test to see if the config file is in the standalone directory
     */
    $standalonedir = dirname( __FILE__ ) . DIRECTORY_SEPARATOR . 'standalone';
    if ( file_exists( $standalonedir . DIRECTORY_SEPARATOR . 'civicrm.settings.php' ) ) {
      	return $standalonedir;
    } elseif ( file_exists( $standalonedir . DIRECTORY_SEPARATOR . 'sites' . DIRECTORY_SEPARATOR .  'default'  . DIRECTORY_SEPARATOR . 'civicrm.settings.php' ) ) {
        $confdir = $standalonedir;
    }

    /**
     * We are within the civicrm module, the drupal root is 2 links
     * above us, so use that
     */
    $currentDir = dirname( __FILE__ ) . DIRECTORY_SEPARATOR;
    if ( file_exists( $currentDir . 'settings_location.php' ) ) {
        include $currentDir . 'settings_location.php';
    }

    if ( defined( 'CIVICRM_CONFDIR' ) && ! isset( $confdir ) ) {
      	$confdir = CIVICRM_CONFDIR;
    } else {
        // make it relative to civicrm.config.php, else php makes it relative
        // to the script that invokes it
        // simple check to see if this is under sites/all or just modules
        if ( strpos( $currentDir, 'sites' . DIRECTORY_SEPARATOR . 'all' . DIRECTORY_SEPARATOR . 'modules' ) !== false ) {
            // seems like this is in drupal5 dir location
            $confdir = $currentDir . '..' . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR . '..';
        } else {
            $confdir = $currentDir . '..' . DIRECTORY_SEPARATOR . '..' . DIRECTORY_SEPARATOR . 'sites';
        }
    }

    if ( file_exists( $confdir . DIRECTORY_SEPARATOR . 'civicrm.settings.php' ) ) {
        return $confdir;
    }

    if ( ! file_exists( $confdir ) && ! $skipConfigError ) {
        echo "Could not find valid configuration dir, best guess: $confdir<br/><br/>\n";
        echo "If this is a standalone installation (i.e. not a Drupal or ";
        echo "Joomla module) and you'd like to re-initialize it, ";
        echo "<a href=\"../install/index.php?mode=standalone\">click here</a>.\n";
        exit( );
    }
            
    $phpSelf  = array_key_exists( 'PHP_SELF' , $_SERVER ) ? $_SERVER['PHP_SELF' ] : '';
    $httpHost = array_key_exists( 'HTTP_HOST', $_SERVER ) ? $_SERVER['HTTP_HOST'] : '';

    $uri    = explode('/', $phpSelf );
    $server = explode('.', implode('.', array_reverse(explode(':', rtrim($httpHost, '.')))));
    for ($i = count($uri) - 1; $i > 0; $i--) {
        for ($j = count($server); $j > 0; $j--) {
            $dir = implode('.', array_slice($server, -$j)) . implode('.', array_slice($uri, 0, $i));
            if (file_exists("$confdir/$dir/civicrm.settings.php")) {
                $conf = "$confdir/$dir";
                return $conf;
            }
        }
    }

    // FIXME: problem spot for Drupal 5.1 config dir layout
    $conf = "$confdir/default";
    return $conf;
}

include_once civicrm_conf_init( ) . '/civicrm.settings.php';