What potential issue arises when setting multiple SESSION variables in a pull-down menu in PHP?

When setting multiple SESSION variables in a pull-down menu in PHP, the potential issue that arises is that only one variable can be selected at a time, leading to potential conflicts or overwriting of values. To solve this issue, you can concatenate the values of the selected options into a single string and then store that string in a single SESSION variable. 

<?php
session_start();

if(isset($_POST['submit'])){
    $selectedValues = implode(',', $_POST['options']);
    $_SESSION['selectedValues'] = $selectedValues;
}
?>
<form method="post">
    <select name="options[]" multiple>
        <option value="option1">Option 1</option>
        <option value="option2">Option 2</option>
        <option value="option3">Option 3</option>
    </select>
    <button type="submit" name="submit">Submit</button>
</form>

Keywords

SESSION variables pull-down menu PHP data loss conflict

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