make web page with single input box that runs php as soon as x number of characters have been entered

I am trying to create a simple web app that will run a php file after text 12 characters long has been entered into a textbox
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Krishna VConnect With a Mentor Commented:
 You can use javascript to keep track of data entered in text area and as the count reaches a specific value, you can do whatever action that is necessary like calling method, etc.

Example @

Hope this helps.
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