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Calling PHP functions

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I created a script on a php page. The script is activated when user clicks the submit button on a form. I want to write functions on the same php page. How do I do this? MyData.php<?function getData(){$fname = _POST['fname']; $lname = _POST['lname']; //statements that tells it to write the information to file} function showData(){$price = _POST['price']; $qty = _POST['qty']; $total = $price * $qty; echo $total;}?> MyOutputPage.php<html><head><title>Sample Page</title></head><body>//I want to call the showData() function on the MyData.php page.//How do I do this? <form action=" " method="post"><input type="submit" value="Submit"/></form></body></html> Once I do this, how do I call individual functions on the page. Is there a way to add it to my page with the html like you do when linking to an external javascript script? Thank You

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first, do you understand that PHP runs before the page has loaded? Everything you want it to do needs to be accounted for in that way. A common technique is to have javascript make AJAX requests to a server side script, by passing it some data, and then that script executes the code.

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