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Home/ Questions/Q 6039389
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T06:21:40+00:00 2026-05-23T06:21:40+00:00

I am getting Notice: Undefined variable: myvariable when I post my form with the

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I am getting Notice: Undefined variable: myvariable when I post my form with the checkbox unchecked.

I need to check if the checkbox is not checked.

How would I do this?

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  1. Editorial Team
    Editorial Team
    2026-05-23T06:21:41+00:00Added an answer on May 23, 2026 at 6:21 am

    Create hidden field before checkbox with same name on html form.

    
    <input type="hidden" value="0" name="check"/>
    <input type="checkbox" value="1" name="check"/>
    

    In this case the value $_POST['check'] is defined always

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