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In order to display some helpful info about the form actions and data, you need to enable the form debug,
You can enable the form debug under the form Settings tab:
Once the debug is enabled and the form is saved, it will display helpful info below the form output, like the form data which is the list of parameters passed to the current page along with any form fields values:
The Vars part will list the returned values by Actions on the form, in this form we had a PHP action named php15, and a Read Data action named read_data16:
The Info section will display more details about the form actions, like SQL statements and other details about the actions processing:
