Web-development informational articles

Preventing go over form submission using php sessions - web-development

 

We've all seen those e-mail on some websites alert not to click a do up more than once or denial consequences, like paying a bill twice, may result. At times we can cause these tribulations by drumming the back or refresh buttons. In this condition I will clarify a attitude whereby a site can make sure each form is submitted only once, in this manner demonstrating that such warnings are needless and, depending on the character of the troubles caused, worth repairing immediately. Let's begin by compelling a look at the course we are studying: Form Submission. As pedantic as it may seem, it will be meaningful to allocate each of the steps in this process:

  • Visitor wishes a page from the ma?tre d' which has a form on it.
  • Server retrieves form and sends to user.
  • User enters data on form and submits to server.
  • Server processes form data and proceeds follow-on page.
  • The scenario we now need to evaluate is when the user re-triggers a preceding form submission process. What we need to find or construct is a little which changes at some point in the form submission course of action which does not depend on the definite form being submitted and which we can tell changed. That was a biased condemnation which fully fine points our solution, so let's break it down. Find or coin a bit which
  • changes at some point in the form submission process,
  • does not depend on the aspect form being submitted, and
  • we can tell changed.
  • Since the item which changes does not depend on the form being submitted (e. g. it doesn't affair if it's a newsletter registration form, patron signup form, payment form, etc. ), the item is not amazing which previously exists and consequently must be created, so let's conceive a form alterable called submissionId and believe it has the 3 properties mentioned above. So far, so good -- or so it appears! The third "property" is that "we can tell [it] changed", but "changed" is not a belongings of a variable, so we need to look at this more closely. In order to tell a bit changed, we must have a good word point, an counter to the difficulty "changed from what?" This is where a meeting adaptable will come into play. If we circumscribe a meeting variable, say $_SESSION['nextValidSubmission'] and treat it as a allusion point, we will have all of the tools basic to defend our visitors. The idea will be to keep the meeting adjustable modernized with the last submissionId sent out and adjustment the submissionId each time it is sent out to the user. Then, if they try to resubmit the data, they will be submitting an old submissionId which doesn't match nextValidSubmission and we will know not to re-process this data. Let's look at this in terms of the processes:

  • Visitor wishes a page from the head waiter which has a form on it.
  • Server retrieves form, generates a new submissionId which is embedded into the form, updates nextValidSubmission, and sends to user.
  • User enters data on form and submits to server.
  • Server processes form data, changes nextValidSubmission, and income ensuing page.
  • Now, if the visitor by hook or by crook resends the data, they will be transfer the old submissionId which will not match the new nextValidSubmission. So, you can now say goodbye to relying on javascript to remove/disable buttons, silly admonition messages, and upset customers by preventing form re-submission.

    Webmaster of Script Reference - The *NEW* PHP Good word & Tutorial Site For Non-Programmers
    See here for more complete information, an case using PHP, and an alternative logic which doesn't demand sessions.


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