This CodeLet will make a single checkbox a require field. This is usefule when you are creating a checkbox in your custom module.
CodeLet:
<?php
$form['terms_condition'] = array(
'#type' => 'checkboxes',
'#title' => t('Terms & condition'),
'#options' => array(
1 => t('I agree to Terms & condition'),
),
'#required' => TRUE,
);
?>
Compatibility:
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