Custom Script in the Reports

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Hello,

I'm new to the custom scripts in the report and I found a lot of useful information in this forum. I found a post that indicated a way to retrieve the report filters in the custom script. However, I'm having trouble retrieving one of the filters.

I'm trying to retrieve a report filter that uses "between" operator.

Do I retrieve the start and end times by $params["search_args"]["search_field0"]["val"][0] and $params["search_args"]["search_field0"]["val"][1] ?

Is there a way to debug the custom script? 

Thanks,

Shashank.