SQL为会话或变量分配错误？

Question

I have created Login forms and registration forms for a website.

The form is posted for validation to checklogin.php and checksign.php, however when it finds any errors it displayes them in the separate file.

The following is the error message for the following validation statement

 if (!$_POST['fullname'] | !$_POST['myusername'] | !$_POST['mypassword'] | !$_POST['remypassword']) {

        die('You did not complete all of the required fields');
    }

My question is: how do i show them in the same page? For instance; in a label next to the form. Thanks, any tips would be of great help. this is the website im making autosales

Answer 1

By structuring your code so that the order of validation can come before final processing, and if not, display the form page again

if($_SERVER['REQUEST_METHOD'] === 'POST')
{
  $valid = false;
  // perform input validations here
  if(dosomething())
  {
    $valid = true;
  }

  // if valid, perform processing here, and either show success page (or redirect)
  if($valid === true)
  {
    // SQL junk here
    include('success.php');
    exit();
  }
}

// render original form after this line