您可以使用parse_request hook. 例如：

add_action( \'parse_request\', function ( $wp ) {
    // Run your actions only if the current request path is exactly \'image-generator\'
    // as in https://example.com/image-generator if the site URL is https://example.com
    if ( \'image-generator\' === $wp->request ) {
        $a   = $_GET[\'a\'];
        $b   = $_GET[\'b\'];
        $etc = \'etc\';
        // ... your code here.

        // And then send the HTTP status and also the Content-Type headers.
        status_header( 200 );
        header( \'Content-Type: image/jpeg\' );
        // ... echo your image.

        exit;
    }
} );