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Couple of isset() questions!(Beginner)


JakeForDesign
Go to solution Solved by requinix,

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  • I originally had the error: "undefined index: password"
  • I researched the error and figured out that I needed to be using isset()
  1. When should I use isset(every time I use the post array?)
  2. Why does this prevent that error from showing up?

 

Also, is this how I should be coding it:

   

 
    // Check whether a password was entered and confirmed correctly
    if (isset($_POST["password"])=="") {
        $passwordIsEmpty = true;
    }
    if (isset($_POST["password2"])=="") {
        $password2IsEmpty = true;
    }
    if (isset($_POST["password"])!= isset($_POST["password2"])) {
        $passwordIsValid = false;
    } 
 
Instead of:
 
    if ($_POST['password'] == "") {
        $passwordIsEmpty = true;
    }
    if ($_POST['password2'] == "") {
        $password2IsEmpty = true;
    }
    if ($_POST['password'] != $_POST['password2']) {
        $passwordIsValid = false;
    }

 

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  • Solution

isset() tells you if the field was submitted with the form. It doesn't give you the value, just that "yes or no" if it's there. Use isset() to check that the value is accessible. If so then you can get to it normally without those warnings.

 

if (!isset($_POST["password"]) || $_POST["password"] == "") { // not present OR empty
    $passwordIsEmpty = true;
}
if (!isset($_POST["password2"]) || $_POST["password2"] == "") { // not present OR empty
    $password2IsEmpty = true;
}

// here you'd have to do more isset()s, but the variables above already know about that
if (!$passwordIsEmpty && !$password2IsEmpty // only check if the passwords match if they were given at all
    && $_POST["password"] != $_POST["password2"]) {
    $passwordIsValid = false;
}
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