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ChronoForms has a Custom Code action that you can use to add PHP to a form event. Usually this is used to process the form data either before the form is loaded or after it is submitted.
The Custom Code action is in the Core Actions group if you are using the Form Wizard. If you use the Easy Wizard there are two copies of the action on the Others | Custom PHP Code tab. These will run PHP after the form is submitted either before or after an Email is sent. The Easy Wizard does not let you run PHP when the form is loaded; if you need this switch to the Form Wizard (also called the Advanced Wizard).
ChronoForms v3 has similar Extra Code Before and After Email boxes on the Form Code tab.
