What is the correct way to validate a checkbox in a PHP contact form?

To validate a checkbox in a PHP contact form, you need to check if the checkbox is checked before processing the form data. This can be done by checking if the checkbox value exists in the $_POST array and if it is equal to the expected value. If the checkbox is not checked, you can display an error message to the user and prevent the form from being submitted. 

// Check if the checkbox is checked
if(isset($_POST['checkbox_name']) && $_POST['checkbox_name'] == 'checkbox_value') {
    // Checkbox is checked, proceed with form processing
} else {
    // Checkbox is not checked, display an error message
    echo "Please check the checkbox.";
}

Keywords

PHP form validation checkbox isset empty

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