How does the behavior of unchecked checkboxes in PHP forms compare to other form elements like select options?

Unchecked checkboxes in PHP forms do not get submitted in the same way as other form elements like select options. If a checkbox is unchecked, its value is not sent as part of the form data. To handle this, you can use the `isset()` function in PHP to check if the checkbox was checked or not. If the checkbox is checked, its value will be set and you can process it accordingly. 

// Check if the checkbox is checked
$checkbox_value = isset($_POST['checkbox_name']) ? $_POST['checkbox_name'] : 'unchecked';

// Process the checkbox value
if($checkbox_value == 'checked') {
    // Checkbox was checked
} else {
    // Checkbox was unchecked
}

Keywords

PHP forms checkboxes select options form elements behavior

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