How to update a checkbox valut with PHP to Mysql

I'm looking for the way to update a checkbox to the mysql database with PHPP.

I have the following code to read and set the checkbox checked and get the value:

$check_value = ($yesorno == "1") ? 1 : 0; if ($check_value == "1") { $check_status = "checked"; echo $check_status; } else { $check_status = ""; echo $check_status; } echo $check_value;

So, if the value is "1" I have the checkbox checked. But how can I update this, if the I uncheck the box or set the box from unchecked to checked?