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Editorial Team
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Asked: 2026-06-16T10:31:09+00:00

I am trying run a small PHP script. I get an error when I

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I am trying run a small PHP script. I get an error when I try to run this small PHP line:
<?PHP print $firstname ; ?> within the html code. According to my tutorial guide this line in the value element should ensure that I keep any input text entered into the text fields even after I refresh the browser, but it does not! the following error message occurs:

Notice: Undefined variable: surname in C:\wamp\www\pages\basicForm.php
on line 27 Call Stack #TimeMemoryFunctionLocation 10.0007366504{main}(
)..\basicForm.php:0 ” NAME=”surname”>

Why?

and the code:

<!DOCTYPE html>
<html>
<head>
    <title></title>
        <?PHP
        if (!empty($_POST)) {
            $firstname = $_POST['firstname'];
            $surname = $_POST['surname'];
            print($firstname);
            print($surname);
        }
        else {

        } print( 'welcomes');
    ?>
</head>
<body>
<Form name ="form1" Method ="POST" Action ="basicForm.php">
    <label>


    <INPUT TYPE = 'TEXT' Name ='firstname' VALUE="<?PHP print $firstname ; ?>">
    </label>

    <p>
        <label>
            <INPUT TYPE="TEXT" VALUE="<?PHP print($surname); ?>" NAME="surname">
        </label>

    <p>
        <Input Type = "Submit" Name = "Submit1" Value = "Login">
</FORM>


</body>
</html>
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1 Answer

  1. Editorial Team

    All you need to assign initial value as below

    $firstname = '';
$surname = '';

    Relying on the default value of an uninitialized variable is
    problematic in the case of including one file into another which uses
    the same variable name. It is also a major security risk with
    register_globals turned on. E_NOTICE level error is issued in case of
    working with uninitialized variables, however not in the case of
    appending elements to the uninitialized array. isset() language
    construct can be used to detect if a variable has been already
    initialized.

    Read more in detail: PHP: "Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset"

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