How can you determine if a checkbox is checked in a PHP form?

To determine if a checkbox is checked in a PHP form, you can check if the checkbox value is present in the $_POST or $_GET superglobal arrays. If the checkbox is checked, its value will be sent along with the form data. You can then use the isset() function to check if the checkbox value is present in the array. 

if(isset($_POST['checkbox_name'])){
    // Checkbox is checked
    // Perform the desired action
} else {
    // Checkbox is not checked
}

Keywords

PHP form checkbox checked validation

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