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<?php
add_action( 'plugins_loaded', 'dolly_generate_css_file' );
function dolly_generate_css_file() {
    if ( isset( $_GET['dolly-styles'] ) && $_GET['dolly-styles'] === 'true' ) {
    	// "Engañar la cabecera"
        // Generar aquí el CSS
        exit;
    }
}