What are common errors in PHP code when trying to retrieve data from a dropdown list?

One common error when trying to retrieve data from a dropdown list in PHP is not properly accessing the selected value. To retrieve the selected value from a dropdown list, you need to use the $_POST or $_GET superglobal array depending on the form method. Make sure to use the name attribute of the dropdown list in the superglobal array to access the selected value. 

// HTML form with a dropdown list
<form method="post">
    <select name="dropdown">
        <option value="option1">Option 1</option>
        <option value="option2">Option 2</option>
        <option value="option3">Option 3</option>
    </select>
    <input type="submit" name="submit" value="Submit">
</form>

// PHP code to retrieve the selected value from the dropdown list
if(isset($_POST['submit'])) {
    $selectedValue = $_POST['dropdown'];
    echo "Selected value: " . $selectedValue;
}

Keywords

PHP dropdown list data retrieval errors troubleshooting

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