counting how many checkbox are checked php/html

Question

Hi I am new with php and I was wondering how am i able to count how many 'checkbox' are checked once I click on submit. For example:

<input type = "checkbox" value = "box" name = "checkbox1"/>
<input type = "checkbox" value = "box" name = "checkbox2"/>
<input type = "checkbox" value = "box" name = "checkbox3"/>

Answer 1

Give the checkboxes names as array like

<input type = "checkbox" value = "box" name = "checkbox[]"/>

And after submit try like

$checked_arr = $_POST['checkbox'];
$count = count($checked_arr);
echo "There are ".$count." checkboxe(s) are checked";

Note : And based on the method that your form submit using...whether it is $_GET or $_POST you need to use $_POST['checkbox'] for POST method and $_GET['checkbox'] for the GET method.

Answer 2

$checkedBoxes = 0;

// Depending on the action, you set in the form, you have to either choose $_GET or $_POST
if(isset($_GET["checkbox1"])){
  $checkedBoxes++;
}
if(isset($_GET["checkbox2"])){
  $checkedBoxes++;
}
if(isset($_GET["checkbox3"])){
  $checkedBoxes++;
}