PHP how to insert unchecked checkbox value [duplicate] - php

Question

This question already has answers here:
POST unchecked HTML checkboxes
(44 answers)
Closed 1 year ago.
Need help. i have 5 checkboxes[] 3 is checked 2 unchecked
i want to insert all checkbox values but if checkbox is checked than insert value 1 and if unchecked insert 0
<input id="answer" type="text" name="answer[]" /> //checked
<input id="answer" type="text" name="answer[]" />
<input id="answer" type="text" name="answer[]" /> /checked
<input id="answer" type="text" name="answer[]" />
<input id="answer" type="text" name="answer[]" /> //checked
if i check the length or size of field than it displays and insert only checked items but i want to insert unchecked also with value 0

Answer 1

The browser does not send unchecked checkbox data to the server, PHP in this case.
So in your PHP you have to know about all the checkboxes that exist on your form and check for the existance of each to decide what to store to your database.
So something like
HTML
<input type="checkbox" name="cb1" value="1" /> //checked
<input type="checkbox" name="cb2" value="2" />
<input type="checkbox" name="cb3" value="3" /> /checked
<input type="checkbox" name="cb4" value="4" />
<input type="checkbox" name="cb5" value="5" /> //checked
if (isset($POST['cb1'])) {
$cb1 = $POST['cb1'];
}else{
// it was not checked because it was not sent
// so use the default or whatever UNCHECKED value when storing to the DB
$cb1 = 0; // for example
}
You can shorten that code a bit by doing
$cb1 = isset($POST['cb1']) ? $POST['cb1'] : 0;