Code-Snippets-Functions/Execute a function on a child site/W3 Total Cache/flush-cache-on-plugin-update.txt

function w3tc_flush_on_plugin_update( $upgrader_object, $options ) {
    if ( function_exists( 'w3tc_flush_all' ) ) {
        w3tc_flush_all();
        echo '<script>console.log("W3 Total Cache flushed.")</script>';
    } else {
        echo '<script>console.log("W3 Total Cache is not installed.")</script>';
    }
}
add_action( 'upgrader_process_complete', 'w3tc_flush_on_plugin_update', 10, 2 );