php - array only storing checkboxes with value 1 (not 0)

I have checkboxes which change value using JavaScript and I want to store values of all checkboxes in a PHP array. But if the user changes the value of one checkbox to "0", the array created has only 2 values (1,1) instead of (1,0,1).

HTML

PHP

$wer=$_POST['cbox1'];
echo implode(",",$wer);

Jquery

$(document).on('click', '.chbo', function() {
this.value ^= 1;
console.log(this.value);
});

Answer

Only successful (checked) controls are submitted. You need to add a hidden input with the default value before the checkbox. Notice you need to hard code the indexes so that the hidden default matches the checkbox value:

So if not checked, only the hidden cbox1[0] with value 0 will be submitted. If checked, then cbox1[0] with value 1 will overwrite the hidden input.

You won't need the JavaScript now because you can change the checkbox to value 0 but if it is not checked it won't be submitted.