What security concerns should be considered when using the "readonly" attribute in PHP forms?

When using the "readonly" attribute in PHP forms, it's important to remember that this attribute only prevents users from editing the field in the browser, but the value can still be manipulated before being submitted. To address this security concern, you should validate the data on the server-side to ensure that the readonly field has not been tampered with. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $readonly_field = $_POST['readonly_field'];
    
    // Validate the readonly field to ensure it has not been tampered with
    if ($readonly_field != 'expected_value') {
        // Handle the error or security breach accordingly
    } else {
        // Proceed with processing the form data
    }
}
?>

Keywords

security concerns readonly attribute PHP forms cross-site scripting data integrity

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