If the checkbox is checked, then the value of checkbox will be passed on the submission of the form. Otherwise, the value is empty. You can validate the value of a checkbox only after the form is being submitted.
For example:
<input type='checkbox' name='accept' value='1' id='checkbox' /> I accept the Terms & Conditions.
Use the following to check/validate the checkbox value at the server end
if (isset($_POST['accept'])) { echo "checked!"; } Or if (!empty($_POST['accept'])) { echo "checked!"; } Or if(isset($_POST['accept’]) && $_POST[‘accept’]!="") { echo "checked!"; }
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