php checkboxes code

checkbox code

$('#' + id).is(":checked")

that gets if the checkbox is checked.

for an array of checkboxes with the same name you can get the list of checked ones by

var boxes = $('input[name=thename]:checked');

then to loop through them and see what's checked you can do

$(boxes).each(function(){
    //do stuff here with this
});

to find how many are checked you can do

$(boxes).size();