Question

When a form gets posted, I get some checkbox values like the below:

Array ( [chk0] => true ,
        [chk1] => true,
        [chk3] => true,
        [chk1002] => on,
        [chk1005] => on 
      ) 

Using PHP,How can I construct a JSON request like this by using the above variables?

        "data":
        [
            {
                "checkboxval": true,
                "id": 0
            },
            {
                "checkboxval": true,
                "id": 1
            },
            {
                "checkboxval": true,
                "id": 3
            },
            {
                "checkboxval": true,
                "id": 1002
            },
            {
                "checkboxval": true,
                "id": 1005
            }
        ]

Please note that my POST variables can have other form variables too, but all checkbox values will be named with the prefix “chk”

Answer 1

$output = array();
foreach ($input as $k => $v) {
  $output[] = array(
    'checkboxval' => !!$v,
    'id' => preg_replace('!^chk!', '', $k),
  );
}
header('Content-Type: application/json');
echo json_encode(array('data' => $output));