How to read if a checkbox is checked in PHP?

Question

How to read if a checkbox is checked in PHP?

Answer 1

When using checkboxes as an array:

You should use in_array():

if(in_array('Orange', $_POST['food'])){
  echo 'Orange was checked!';
}

Remember to check the array is set first, such as:

if(isset($_POST['food']) && in_array(...