HTML form PHP post to self to validate or submit to new page

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When all your conditions are met you can use header('Location: http:mywebsite.com/otherAction.php')

// Validate input and sanitize
if ($_SERVER['REQUEST_METHOD']== "POST") {
   $valid = true; //Your indicator for your condition, actually it depends on what you need. I am just used to this method.

   if (empty($_POST["firstName"])) {
      $firstNameErr = "First name is required";
      $valid = false; //false
   }
   else {
      $firstName = test_input($_POST["firstName"]);
   }
   if (empty($_POST["lastName"])) {
      $lastNameErr = "Last name is required";
      $valid = false;
   }
   else {
      $lastName = test_input($_POST["lastName"]);
   }

  //if valid then redirect
  if($valid){
   header('Location: http://mywebsite.com/otherAction.php');
   exit();
  }
}

In some of my works, my setup is like this but I learned something not good here. That’s when you refresh the page after submitting the form , POST values still remains and possible for duplicating entries. Which is not good IMO.

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