How can PHP scripts recognize which checkbox was activated when passing information through a POST form?

When passing information through a POST form, PHP scripts can recognize which checkbox was activated by checking if the checkbox was included in the POST data. If the checkbox was checked, its value will be sent in the POST data. By checking if the checkbox value exists in the POST data, you can determine which checkbox was activated. 

if(isset($_POST['checkbox_name'])) {
    // Checkbox was checked
    // Perform actions based on this checkbox being activated
} else {
    // Checkbox was not checked
}

Keywords

PHP POST form checkbox activated recognize

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