What are some key considerations when designing PHP scripts to handle user-selected values from checkboxes?

When designing PHP scripts to handle user-selected values from checkboxes, it is important to properly sanitize and validate the input to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. Additionally, you should ensure that your script can handle multiple selected values from checkboxes and process them accordingly. Lastly, consider using an array to store and manipulate the selected values efficiently.

// Sanitize and validate the input from checkboxes
$selectedValues = isset($_POST['checkbox_values']) ? $_POST['checkbox_values'] : array();
$selectedValues = array_map('intval', $selectedValues);

// Process the selected values
foreach ($selectedValues as $value) {
    // Perform necessary actions with each selected value
    echo "Selected value: " . $value . "<br>";
}