Insert Data into MySQL Database Using Radio Button in PHP doesnt work properly undefined index

Question

these are my forms:

<Form name ="formbehuizing" Method ="Post" ACTION ="radiobutton.php">
        <Input type = 'Radio' Name ='behuizing' value= 'behuizing1'>Sharkoon VS3-S red </br>
        <Input type = 'Radio' Name ='behuizing' value= 'behuizing2'>Sharkoon VS3-S blue </br>
        <Input type = 'Radio' Name ='behuizing' value= 'behuizing3'>Sharkoon VS3-S green </br>

        </FORM>

<Form name ="formvoeding" Method ="Post" ACTION ="radiobutton.php">
        <Input type = 'Radio' Name ='voeding' value= 'voeding1'>Cooler Master G600 EU</br>
        <Input type = 'Radio' Name ='voeding' value= 'voeding2'>Cooler Master B700 </br>


        </FORM>`<Form name ="formprocessor" Method ="Post" ACTION ="radiobutton.php">
        <Input type = 'Radio' Name ='processor' value= 'processor1'>Intel&reg; Core&trade; i3 4130 3,4 GHz</br>
        <Input type = 'Radio' Name ='processor' value= 'processor2'>Intel&reg; Core&trade; i5 4670K 3.40 Ghz </br>
        <Input type = 'Radio' Name ='processor' value= 'processor3'>Intel&reg; Core&trade; i7 4770K 3.5 GHz </br>

        </FORM>`

this is the radiobutton.php file

<?php
include_once 'includes/db_connect.php';
include_once 'includes/functions.php';

sec_session_start();
if(login_check($mysqli) == true) {

$behuizing= mysqli_real_escape_string($mysqli, $_POST['behuizing']);
$voeding= mysqli_real_escape_string($mysqli, $_POST['voeding']);
$processor = mysqli_real_escape_string($mysqli, $_POST['processor']);

$sql="INSERT INTO dario_bestelling (behuizing, voeding, processor)
VALUES ('$behuizing', '$voeding', '$processor')";

if (!mysqli_query($mysqli,$sql)) {
  die('Error: ' . mysqli_error($mysqli));
}
echo "1 record added";

mysqli_close($mysqli);
} else { 
        echo 'You are not authorized to access this page, please login.';
}
?>

i keep getting the undefined index notice,the auto increment works but the info that normally is added by the radiobuttons isnt added in my database.

Answer 1

You're using separate forms for each set of radio buttons, and none of them have a submit button. Only the inputs within the form that is being submitted will be passed to the server. So $_POST['behuizing'] , $_POST['voeding'] , and $_POST['processor'] are not defined, giving you that error. Your form should look like this:

<Form name ="formbehuizing" Method ="Post" ACTION ="radiobutton.php">
    <Input type = 'Radio' Name ='behuizing' value= 'behuizing1' />Sharkoon VS3-S red <br />
    <Input type = 'Radio' Name ='behuizing' value= 'behuizing2' />Sharkoon VS3-S blue <br />
    <Input type = 'Radio' Name ='behuizing' value= 'behuizing3' />Sharkoon VS3-S green <br /><br />

    <Input type = 'Radio' Name ='voeding' value= 'voeding1' />Cooler Master G600 EU<br />
    <Input type = 'Radio' Name ='voeding' value= 'voeding2' />Cooler Master B700 <br /><br />

    <Input type = 'Radio' Name ='processor' value= 'processor1' />Intel&reg; Core&trade; i3 4130 3,4 GHz<br />
    <Input type = 'Radio' Name ='processor' value= 'processor2' />Intel&reg; Core&trade; i5 4670K 3.40 Ghz <br />
    <Input type = 'Radio' Name ='processor' value= 'processor3' />Intel&reg; Core&trade; i7 4770K 3.5 GHz <br />

    <Input type = 'submit' Name ='submit' value= 'Submit' ><br />

</FORM>

Also, to avoid the error in the event someone doesn't check any of the buttons on a particular set (like processor), you can use isset() like this:

if ( isset( $_POST['behuizing'] ) && isset( $_POST['voeding'] ) && isset( $_POST['processor'] ) ) {
    $behuizing = mysqli_real_escape_string($mysqli, $_POST['behuizing']);
    $voeding = mysqli_real_escape_string($mysqli, $_POST['voeding']);
    $processor = mysqli_real_escape_string($mysqli, $_POST['processor']);

    $sql="INSERT INTO dario_bestelling (behuizing, voeding, processor) 
        VALUES ('$behuizing', '$voeding', '$processor')";

    if (!mysqli_query($mysqli,$sql)) {
      die('Error: ' . mysqli_error($mysqli));
    }
    echo "1 record added";
} else {
    echo "You didn't choose all the options! No record was added. Please choose one option from each category";
}