Wait for input

Is there a function in PHP that will allow a script to wait for user input before continuing the script.

The problem I have is that if a user inputs a value and that value exists already in the database, they will have the option to either overwrite the existing field or enter a new value.

I know I can do this with a form, but just curious as to if I can do it another way.

You might be able to do it with ajax, but not really sure.

You can not interrupt a request / response iteration with sub-queries and continue the previous request / response after the sub-query. Any interruption will scrap the current transaction.

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When you see things like "Check if this username exists" in user registration forms, they're using AJAX like spoof mentioned to ask the server if the name exists.

Could something like that work for you ? A button that the user can click to see if the value exists ?

There could also be a checkbox to signal the overwrite.

Thanks! I will definitely look into AJAX.

If you're not sure where to start, maybe having a look at jQuery won't hurt. Using jQuery's ajax is pretty simple.