Documentation Support > Developers > ZAPEngine
Format: function ZAPengine()
Explanation: This is the main ZAP function, called when a ZAP form is submitted. It is triggered by $HandleActions['zap'], which is why forms can be blocked by setting $DefaultPasswords['zap'] to some secret value.
Here is a basic outline of how the function works.
1. ZAP Secure is called to authenticate the form and set up the field=value array (called $ZAParray). A few initialization variables are set.
2. A foreach loop is begun which processes each element in the array one at a time.
3. A series of conditionals is run on each field name, triggering any commands where there is a match.
4. A few lines of code are set up to check and see if there is an Extension command (a ZAPX function) that matches the field name. If so that function is called. See Custom Extensions for details.
5. The page is either redirected to a new page, or refreshed if nextpage is set to the current page.
That's about it. The actual ZAP Engine is barely 100 lines--counting comments!