What is the best way to determine a Wordpress version remotely?

I have numerous sites and its becoming a nuisance keeping them all up to date, so I would ideally like to compile a list where I can display the version of each website automatically. So I can see at the drop of a hat which ones needs updated and so on.

I have remote access to all off their databases, I had thought about querying the wp_options table for the DB Version but that isn't specific enough when it comes to smaller version updates as far as I am aware.

Any thoughts?


Here's a demo plugin


/** Plugin Name: My JSON data **/ 

add_filter( 'query_vars', function( $qv ){
    $qv[] = 'mydata';
    return $qv;

add_action( 'template_redirect', function(){

    $input = get_query_var( 'mydata' );
    $secret = 'abcdefg'; // Edit this

    if( ! empty( $input ) )
        if( $secret === $input )
            $data = array( 
                        'version'   => $GLOBALS['wp_version'],
                        'foo'       => 'bar', 

            wp_send_json_success( $data );

} );

where example.com/?mydata=abcdefg gives


and example.com/?mydata=wrong shows:


I wouldn't recommend trying to bridge a system to check WordPress, espiecally since the WordPress core since 3.7.1 comes with this functionality.

WordPress 3.7.1+ Auto Updates, so it would be best to upgrade all your WordPress sites - this would also be a great idea for security purposes.

What you might want to consider is removing any redundant plugins and have a plan for updating those plugins every few months too.

3rd-party plugins are usually the reason a site is vulnerable, more so than the core of WordPress. Fight the fire before it becomes a fire in the first place! Use less plugins or keep on top of them.

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