WP 3.1 – pg4wp – Cannot redeclare class wpdb

Hi,

My blog was ok whith WordPress 3.0.4 and pg4wp 1.1.0 until I updated to wordpress 3.1 !

PHP logs shows a PHP Fatal error:  Cannot redeclare class wpdb in /usr/share/wordpress/htdocs/wp-content/db.php(37) : eval()'d code on line 52

In wordpress 3.0.5 the require_wp_db(); – call in the /wp-settings.php – is implemented in the file /wp-includes/functions.php which is :

function require_wp_db() {
        global $wpdb;
        if ( file_exists( WP_CONTENT_DIR . '/db.php' ) )
                require_once( WP_CONTENT_DIR . '/db.php' );
        else
                require_once( ABSPATH . WPINC . '/wp-db.php' );
}

The class wpdb – in /wp-includes/wp-db.php – is evaluated by the eval function in /wp-content/db.php file from pg4wp :

eval( str_replace( array_keys($replaces), array_values($replaces), file_get_contents(ABSPATH.'/wp-includes/wp-db.php')));

The evaluation is done after the replacement of MySQL names to postgres ones.

But in WordPress 3.1, require_wp_db() function has moved into the file /wp-includes/load.php. The new implementation is :

function require_wp_db() {
        global $wpdb;

        require_once( ABSPATH . WPINC . '/wp-db.php' );
        if ( file_exists( WP_CONTENT_DIR . '/db.php' ) )
                require_once( WP_CONTENT_DIR . '/db.php' );

        if ( isset( $wpdb ) )
                return;

        $wpdb = new wpdb( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST );
}

in those conditions; /wp-includes/wp-db.php is evaluated twice ! with the wp-content/db.php. The class wpdb can not be redeclared twice.

My solution is to … come back. I simply re-implemented the WP 3.1 require_wp_db() function like this :

function require_wp_db() {
        global $wpdb;

        if ( file_exists( WP_CONTENT_DIR . '/db.php' ) )
                require_once( WP_CONTENT_DIR . '/db.php' );
        else
                require_once( ABSPATH . WPINC . '/wp-db.php' );

        if ( isset( $wpdb ) )
                return;

        $wpdb = new wpdb( DB_USER, DB_PASSWORD, DB_NAME, DB_HOST );
}

Hope, this could help …