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Editorial Team
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Asked: 2026-05-30T02:09:43+00:00

I have a singleton class that I am using as part of a CAPTCHA

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I have a singleton class that I am using as part of a CAPTCHA system to generate the code and image etc.

I have one script included on the html form that loads the class singleton, generates the code and image, and outputs it to the browser. I then have another script to validate and process the form. This loads the class singleton to retrieve the instance that was created previously, and calls the function to validate the code.

The problem I’m having is that when I’m validating the form the code that was generated on the form has changed or is completely absent when I come to validate it!

I haven’t started or stored anything in the php session, but a session is created on the page the form is loaded in. Is the instance of the singleton somehow linked to that session? If it’s a named session or something?

OR…have I completely misunderstood how singleton classes work? In which case can anyone tell me how I can retrieve the instance of the class that is created on the html form page to use again to validate the code in the form processing script? – And maybe tell me how I should be using singletons!

Many thanks.

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1 Answer

  1. Editorial Team

    OR…have I completely misunderstood how singleton classes work?

    Partially. Since PHP has no ASP.NET alike application variables, objects in PHP live as long as the request does, unless serialized (for example in a session).

    As a solution to your problem: save the captcha code (or the captcha class, which is a bit of overkill imho) in a session variable, like $_SESSION['captcha'].

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