How can you ensure that unchecked checkboxes or radio buttons are not transmitted in PHP?

When submitting a form with checkboxes or radio buttons in PHP, unchecked checkboxes and radio buttons are still transmitted in the form data. To ensure that only the checked checkboxes or radio buttons are transmitted, you can use the isset() function to check if the checkbox or radio button is checked before processing the form data. 

// Check if the checkbox is checked before processing the form data
if(isset($_POST['checkbox_name'])) {
    // Checkbox is checked, process the form data
    $checkbox_value = $_POST['checkbox_name'];
} else {
    // Checkbox is unchecked, handle accordingly
}

Keywords

PHP form handling isset() $_POST data validation

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