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Yes, you can get the value in the text boxes and send or redirect the data to a PHP file.
Please check these 2 helpful guides:
If you are planning to copy the value entered on 1 text field to another then you can use the "Update/Calculate Field" conditions. Please check this guide: How-to-Populate-Field-with-a-Value-from-another-Field
If this is not what you need, then please let us know and provide more details about your issue. Thank you.