It has worked for me. If you are seeing my_string exposed, then it means W3_total_cache is not seeing your code and replacing it. Are you sure you have the plugin enabled, preview mode disabled and page caching enabled?
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It has worked for me. If you are seeing my_string exposed, then it means W3_total_cache is not seeing your code and replacing it. Are you sure you have the plugin enabled, preview mode disabled and page caching enabled?